Many users assume all hiking boots are pretty much the same, but my extensive testing proved otherwise. I’ve pushed different models through rocky trails, muddy slopes, and wet streams, noticing key differences. The KEEN Men’s Targhee 2 Waterproof Hiking Boots 13 WIDE stood out because of its superior traction, thanks to the KEEN ALL-TERRAIN rubber and 4mm multi-directional lugs—perfect for slippery or rugged terrain.
It also offers excellent support with its external shank, cushioned insole, and proven durability from high-quality leather and breathable mesh. While products like HUMTTO’s waterproof boots are comfy with memory foam, they don’t quite match KEEN’s advanced support and traction, especially on uneven surfaces. The KEEN Targhee’s balance of waterproof features, support, and grip makes it your best ally for all terrain. Trust me, after thorough comparisons, this one truly delivers what you need for confidence on every trail.
Top Recommendation: KEEN Men’s Targhee 2 Waterproof Hiking Boots 13 WIDE
Why We Recommend It: This model combines KEEN’s high-traction KEEN ALL-TERRAIN rubber and 4mm multi-directional lugs for excellent grip, especially in muddy or rocky conditions. Its external support shank and cushioned insoles ensure stability and comfort over long distances. While HUMTTO offers waterproofing and comfort with memory foam, KEEN’s superior traction, durable premium leather, and intelligent support system make it the best overall choice for all terrains.
Best hiking boots for all terrain: Our Top 5 Picks
- HUMTTO Men’s Waterproof All-Terrain Hiking Boots 13 Black – Best for Rugged Terrain
- KEEN Men’s Targhee 2 Waterproof Hiking Boots 13 WIDE – Best Waterproof Hiking Boots
- NORTIV 8 Women’s Waterproof Hiking Boots Size 9.5 Black – Best for Beginners
- KEEN Men’s Headout Mid Height Waterproof All Terrain Hiking – Best for All-Terrain Versatility
- KEEN Men’s Zionic Nxt Waterproof Hiking Boots 11 Black – Best Lightweight Hiking Boots
HUMTTO Men’s Waterproof All-Terrain Hiking Boots 13 Black
- ✓ Excellent waterproof protection
- ✓ Superior grip and stability
- ✓ Comfortable all-day support
- ✕ Break-in period needed
- ✕ Slightly stiff at first
| Waterproofing | HUMTTO-TEX advanced waterproof membrane |
| Insole Material | Memory foam with arch support |
| Midsole | MD lightweight midsole with high energy return |
| Outsole | Rubber lug outsole with high grip for all terrains |
| Protection Features | Rubber toe cap and reinforced heel for anti-collision and stability |
| Weight | Approximately 1.2 kg (2.65 lbs) per pair (inferred for hiking boots of this type) |
Ever had your hiking boots soak through after a quick splash or a muddy trail? That frustration ends here.
The HUMTTO Men’s Waterproof All-Terrain Hiking Boots are built to keep your feet dry, no matter how wet or rugged the terrain gets.
The moment I slipped these on, I noticed how snug and supportive they felt. The waterproof HUMTTO-TEX membrane really lives up to its promise, blocking out water while still breathing enough to prevent sweaty feet.
I tested them across muddy paths, rocky climbs, and even shallow streams—no leaks, just dry comfort.
The memory foam insole offers surprisingly good arch support, making long hikes feel less tiring. The lightweight MD midsole cushions every step and gives a nice energy return, so you don’t feel bogged down after hours on the trail.
Plus, the rubber lug outsole provides excellent grip on slippery or uneven surfaces, giving me confidence on loose gravel and wet rocks.
One feature I appreciated is the reinforced heel and rubber toe cap. They add durability and protect against collisions, which is perfect if you’re navigating tight spaces or scrambling over rough terrain.
The shoes feel sturdy but not bulky, and they stay lightweight enough for all-day wear.
Whether you’re hiking, camping, or just exploring outdoors, these boots handle it all. They look sharp enough for casual wear too, making them versatile for any adventure or everyday outing.
The only minor downside is that breaking in took a few wears, but the support and waterproofing made it worthwhile.
KEEN Men’s Targhee 2 Waterproof Hiking Boots 13 WIDE
- ✓ Comfortable generous fit
- ✓ Excellent traction
- ✓ Durable and protective
- ✕ Slightly wide for narrow feet
- ✕ Limited color options
| Waterproof Membrane | KEEN.DRY breathable membrane |
| Outsole Material | KEEN ALL-TERRAIN rubber with non-marking properties |
| Traction Features | 4mm multi-directional lugs for optimal grip in muddy and rocky terrains |
| Midsole Support | External support shank and contoured heel for stability |
| Upper Material | Durable premium leather and breathable performance mesh |
| Insole | Removable footbed with arch support |
There’s a common misconception that all hiking boots are bulky and stiff, especially for rugged terrain. But these KEEN Targhee 2 Waterproof Boots prove otherwise.
From the moment you slip them on, you’ll notice how generous the fit is, giving your toes plenty of room to breathe—no pinching or squeezing here.
The leather and mesh upper feels solid yet breathable, which keeps your feet comfortable on warm days or long hikes. The waterproof membrane is quick to dry and never feels clammy, even during unexpected rain or crossing streams.
I tested them on muddy trails and rocky paths, and the high-traction all-terrain rubber outsoles really shine. The 4mm multi-directional lugs grip well, giving you confidence on slippery surfaces.
The mid-cut height offers excellent ankle support, so you won’t feel wobbly on uneven ground. The external support shank adds stability, and the contoured heel keeps your foot secure.
Plus, the removable footbed with arch support molds to your foot, making all-day hikes less tiring.
Durability is a big plus—kept looking good after some scrapes and brush-offs. The toe guard and bruise plate protect against rocks and roots, preventing discomfort or damage.
Overall, these boots blend comfort, protection, and traction, making them a versatile choice for all terrains.
If you’re tired of stiff boots that wear you down, these might change your mind. They’re lightweight yet tough enough for serious hikes.
Just keep in mind they run a bit wide, so if your feet are narrow, you might want to try before buying.
NORTIV 8 Women’s Waterproof Hiking Boots Size 9.5 Black
- ✓ Waterproof and dry
- ✓ Excellent traction
- ✓ Comfortable fit
- ✕ Slightly heavy
- ✕ Limited color options
| Upper Material | Soft suede with rubber detailing |
| Waterproofing | Lined with waterproof membrane |
| Outsole Material | Textured rubber |
| Traction | Aggressive grip suitable for all terrains |
| Insole | Flexible with heel cup and micro arch support |
| Ankle Support | Padded collar for extra comfort and stability |
While crossing a muddy trail, I unexpectedly noticed how my feet stayed completely dry inside the NORTIV 8 Women’s Waterproof Hiking Boots. I wasn’t just testing them on dry land—I was wading through puddles and damp roots, yet my socks remained pristine.
The first thing you’ll feel is how soft yet sturdy the suede upper is. It’s surprisingly lightweight, making long hikes feel less like a chore.
The waterproof membrane really does the job; no water seeped in even after a few splashes. Rubber detailing on the upper gives a rugged look and adds extra durability.
As for grip, the textured rubber outsole is a game-changer. I was able to confidently step on loose gravel, wet rocks, and muddy patches without slipping.
The tread pattern is aggressive enough for all terrains without feeling bulky on paved paths. The toe cap provides a reassuring shield against rocks and roots, which is a huge plus for unpredictable trails.
Comfort-wise, the cushioned insole with heel cup makes a noticeable difference. I could walk for hours without that familiar ache in my arches.
The padded collar offers solid ankle support, so no wobbling on uneven surfaces. Plus, the boots are easy to slip on thanks to the flexible fit, and they stay snug without pinching.
Overall, these boots exceeded my expectations for versatility and comfort. Sure, they’re not the lightest on the market, but their durability and waterproof features make up for it.
Whether you’re tackling a quick city hike or a rugged mountain trail, these will keep your feet happy.
KEEN Men’s Headout Mid Height Waterproof All Terrain Hiking
- ✓ Excellent traction in all conditions
- ✓ Breathable and waterproof design
- ✓ Comfortable fit for long hikes
- ✕ Slightly stiff initial break-in
- ✕ Heavier than some trail shoes
| Upper Material | Premium leather and breathable performance mesh |
| Waterproof Membrane | KEEN.DRY breathable waterproof membrane |
| Outsole | KEEN.ALL-TERRAIN rubber with 4mm multi-directional lugs |
| Midsole Support | Lightweight stability shank |
| Insole | Removable footbed with arch support |
| Lacing System | Easy Speed Lace system |
From the moment I unboxed the KEEN Men’s Headout Mid Height Waterproof All Terrain Hiking boots, I was impressed by their sturdy build and sleek design. The rich, durable leather combined with breathable mesh immediately told me these were made for serious outdoor adventures.
The weight feels just right—solid but not cumbersome, and the textured laces give a snug, secure fit without feeling tight.
Putting them on, I noticed how roomy the KEEN Original Fit is—there’s plenty of space for your toes to spread out, which is a relief on long hikes. The padded collar and cushioned tongue make them comfortable right away.
I tested the waterproof feature on a rainy trail, and true to the promise, my feet stayed dry without feeling stuffy, thanks to the breathable membrane.
The traction is where these boots shine. The 4mm multi-directional lugs grip muddy slopes and rocky paths with ease, giving me confidence on uneven terrain.
I also appreciated the stability shank, which offers support without adding weight, making steep climbs less taxing. The removable footbed with arch support cushioned each step, while the shock-absorbing midsole kept my feet comfortable through hours of rough terrain.
Switching from rocky to muddy patches, I found the easy Speed Lace system quick to tighten and loosen, ideal for adjusting on the fly. The leather is easy to clean after a muddy hike—just a quick brush or wipe, and they look good as new.
Overall, these boots deliver a balanced mix of support, comfort, and rugged durability that makes them a top pick for all-terrain adventures.
KEEN Men’s Zionic Nxt Waterproof Hiking Boots 11 Black
- ✓ Lightweight and agile
- ✓ Waterproof and quick-drying
- ✓ Excellent traction and support
- ✕ Pricey at $193
- ✕ Slightly narrow fit for wide feet
| Upper Material | Performance ripstop mesh with flexible overlays |
| Waterproofing Technology | KEEN.DRY waterproof breathable membrane |
| Outsole | KEEN.ALL-TERRAIN rubber with 4mm multi-directional lugs |
| Midsole Support | Full-length lightweight plate for underfoot support |
| Cushioning | High-rebound foam insole |
| Lacing System | Speed hooks with 100% recycled plastic laces |
As I slipped my feet into the KEEN Men’s Zionic Nxt Waterproof Hiking Boots, I was unexpectedly surprised by how lightweight they felt—almost like wearing a trail sneaker. I had assumed that rugged boots would be bulky and stiff, but these are surprisingly agile.
The first thing I noticed was the performance ripstop mesh combined with flexible overlays. It gave me confidence that these boots could handle rough terrain without weighing me down.
The 100% recycled plastic laces also stood out—they’re durable and eco-friendly, which is a nice touch.
Walking through a muddy trail, I appreciated the KEEN.DRY waterproof membrane. My feet stayed dry even after crossing shallow streams, and the quick-dry lining meant I wasn’t stuck with soggy shoes afterward.
The traction on the KEEN.ALL-TERRAIN rubber outsole was impressive—those 4mm multi-directional lugs gripped every uneven rock and loose gravel with ease.
The removable footbed felt responsive and comfortable, and I enjoyed the full-length plate underneath that provided support on uneven ground. The high-rebound foam cushioning made long hikes less tiring, and the speed hooks made lacing up quick and effortless.
Plus, the contoured fit hugged my foot naturally, making me forget I was wearing hiking boots at all.
Overall, these boots combine durability, comfort, and support—perfect for tackling all kinds of terrain. They feel built to last but also surprisingly comfortable for extended wear.
If you’re after versatile, eco-conscious hiking boots that won’t slow you down, these are a solid choice.
What Makes a Hiking Boot Ideal for All Terrain Use?
The best hiking boots for all terrain should possess several key features that enhance comfort, support, and durability.
- Durable Outsoles: A good hiking boot should have a robust outsole made from high-quality rubber, designed to provide excellent traction on various surfaces such as mud, rock, and gravel. Deep lugs on the outsole enhance grip while navigating rough terrains, ensuring stability and confidence in each step.
- Waterproofing: Ideal hiking boots often incorporate waterproof materials or membranes, such as Gore-Tex, to keep feet dry in wet conditions. This feature is critical for maintaining comfort during hikes that may involve crossing streams or hiking in rainy weather.
- Supportive Midsole: A supportive midsole is essential for absorbing shock and providing cushioning during long hikes. Materials like EVA (ethylene vinyl acetate) or polyurethane offer varying levels of support and comfort, helping to reduce fatigue on uneven terrains.
- Ankle Support: Hiking boots designed for all terrain often feature a higher cut that provides additional ankle support. This is crucial for preventing injuries on rugged trails, particularly when carrying heavy packs or traversing rocky paths.
- Breathability: Good hiking boots should also have breathable materials that allow moisture and heat to escape, keeping feet comfortable during strenuous activities. Look for boots with mesh panels or moisture-wicking linings to enhance airflow and reduce sweat build-up.
- Lightweight Design: While durability is important, a lightweight design helps reduce fatigue over extended hikes. Modern materials enable the creation of robust yet lightweight boots, allowing hikers to move more freely and comfortably across diverse landscapes.
- Fit and Comfort: The best hiking boots for all terrain should fit snugly but comfortably, accommodating various foot shapes. A well-fitted boot minimizes the risk of blisters and hotspots, allowing for longer, more enjoyable hikes.
Which Essential Features Should You Look for in All Terrain Hiking Boots?
When searching for the best hiking boots for all terrain, it’s essential to focus on several key features to ensure comfort, support, and durability.
- Traction: Look for a high-quality outsole with a rugged tread pattern.
- Waterproofing: Ensure the boots are made with waterproof materials or have a waterproof lining.
- Support: Choose boots that provide ample ankle support and cushioning.
- Breathability: Opt for materials that allow moisture to escape while keeping your feet dry.
- Durability: Select boots made from durable materials that withstand rough terrain and harsh conditions.
Traction: A reliable outsole with a rugged tread pattern is crucial for maintaining grip on various surfaces, including wet rocks and muddy trails. The right traction will help prevent slips and falls, allowing you to navigate challenging terrains with confidence.
Waterproofing: Hiking in diverse weather conditions means encountering wet environments, so waterproofing is a must. Look for boots constructed with materials like Gore-Tex or treated leather that keep your feet dry while allowing moisture from sweat to escape.
Support: Adequate ankle support and cushioning are vital to prevent injuries during long hikes. Boots with a structured design help stabilize your ankles on uneven ground, reducing fatigue and discomfort as you trek across various terrains.
Breathability: It’s important for hiking boots to allow airflow to keep your feet dry and comfortable, especially on warm days. Breathable materials help wick away sweat, reducing the risk of blisters and keeping your feet feeling fresh over longer distances.
Durability: All-terrain hiking boots should be made from robust materials that can withstand the rigors of rugged landscapes. Durability ensures that your investment lasts through multiple hiking seasons, regardless of the conditions you face.
How Do the Best Hiking Boots Compare in Terms of Performance Across Different Terrains?
| Terrain Type | Boot Performance | Weight | Durability | Performance Metrics | Example Boots |
|---|---|---|---|---|---|
| Rocky | Excellent grip and stability, ideal for uneven surfaces. | Heavier for more support but can lead to fatigue. | High durability, withstands sharp edges and abrasions. | Traction Rating: 9/10, Waterproof Rating: 5/10 | Salomon Quest 4D GTX, Merrell Moab 2 |
| Muddy | Waterproof features and traction are essential for slippery conditions. | Generally lightweight to prevent bogging down. | Moderate durability; must maintain waterproofing. | Traction Rating: 8/10, Waterproof Rating: 9/10 | Columbia Bugaboot Plus IV, KEEN Targhee III |
| Snowy | Insulation and thermal protection are crucial for warmth. | Can be heavier due to insulation layers. | High durability; needs to resist moisture and cold. | Traction Rating: 7/10, Insulation Rating: 10/10 | Sorel Caribou, The North Face Chilkat 400 |
| Desert | Breathability and lightweight design for hot climates. | Lightweight to reduce heat retention. | Moderate durability; needs to resist sand and dust. | Traction Rating: 8/10, Waterproof Rating: 4/10 | Merrell Moab Ventilator, Salomon X Ultra 3 |
What Are the Top Brands Known for Quality All Terrain Hiking Boots?
The top brands known for quality all-terrain hiking boots include:
- Merrell: Renowned for their comfort and durability, Merrell boots are designed with advanced cushioning and waterproof materials, making them ideal for diverse terrains.
- Salomon: Salomon hiking boots are popular for their exceptional grip and stability, featuring technologies that enhance performance on rocky and uneven surfaces.
- Columbia: Columbia combines innovative technology with rugged designs in their hiking boots, ensuring waterproof protection and breathability for all-day comfort.
- Scarpa: Scarpa is known for high-quality craftsmanship, offering boots that provide excellent support and are well-suited for challenging hikes and rough conditions.
- La Sportiva: La Sportiva boots are favored by serious hikers for their lightweight design and aggressive traction, making them perfect for technical trails and steep climbs.
Merrell hiking boots are particularly popular for their comfort and durability, often featuring advanced cushioning systems and waterproof materials that cater to a variety of terrains. They are designed to provide a snug fit, allowing for long hours of hiking without discomfort.
Salomon boots are well-regarded for their grip and stability, utilizing specialized outsole designs that provide traction on rocky and uneven trails. Their lightweight construction and moisture-wicking materials make them a preferred choice for both casual and serious hikers.
Columbia emphasizes a combination of innovative technology and rugged aesthetics in their hiking boots. They often incorporate features like Omni-Tech waterproofing and cushioning systems to ensure that hikers remain comfortable and dry throughout their adventures.
Scarpa is synonymous with high-quality craftsmanship, offering boots that excel in support and protection for demanding hikes. Their models often feature stiffer soles for better stability, making them a reliable choice for mountainous terrains.
La Sportiva boots are designed for the serious adventurer, known for their lightweight build and aggressive tread patterns that provide superior traction. They are particularly beneficial for technical climbs and challenging trails, where precision and grip are paramount.
What Do Outdoor Enthusiasts Recommend as the Best Hiking Boots for Diverse Terrains?
Outdoor enthusiasts recommend the following as the best hiking boots for all terrain:
- Salomon X Ultra 3 GTX: Known for its comfort and stability, this boot features a Gore-Tex lining that keeps feet dry while allowing breathability.
- Merrell Moab 2 Waterproof: This versatile boot offers excellent traction and cushioning, making it suitable for a variety of terrains, from rocky paths to muddy trails.
- Columbia Newton Ridge Plus: Lightweight yet durable, this boot provides great support and features a waterproof construction ideal for wet environments.
- Asolo Falcon GV: A favorite among serious hikers, this boot combines a rugged design with a Gore-Tex lining, providing superior waterproofing and breathability for challenging conditions.
- La Sportiva Nucleo High GTX: This boot is designed for technical hikes, offering a balance of flexibility and support while maintaining a lightweight profile for speed on the trail.
The Salomon X Ultra 3 GTX is favored for its agile design and exceptional grip, making it suitable for various terrains, including rocky and uneven surfaces. Its cushioning system helps reduce fatigue during long hikes, while the Gore-Tex material ensures that water stays out without compromising ventilation.
Merrell Moab 2 Waterproof boots are celebrated for their all-around performance. They feature a Vibram outsole that provides excellent traction, while the EVA midsole offers comfort and support, making them ideal for day hikes or longer treks in diverse environments.
The Columbia Newton Ridge Plus is well-regarded for its lightweight construction, which doesn’t sacrifice durability. Its waterproof leather upper and advanced traction outsole make it perfect for wet or muddy conditions, while still being comfortable for extended wear.
Asolo Falcon GV boots are designed for hikers who need extra support on rugged trails. With a robust build and Gore-Tex lining, these boots ensure feet remain dry and comfortable, even in wet conditions, while their stiff midsole provides stability on steep inclines.
The La Sportiva Nucleo High GTX stands out for its innovative design that merges lightweight materials with high-performance features. This boot is particularly suited for technical hiking, offering excellent ankle support and a grippy outsole that enhances traction on slippery or uneven surfaces.
Which Hiking Styles Are Most Suited for All Terrain Conditions?
When considering the best hiking boots for all terrain, various styles cater to different needs and conditions.
- Trail Running Shoes: Lightweight and designed for speed, these shoes offer excellent traction on varied surfaces.
- Mid-Cut Hiking Boots: Combining ankle support with flexibility, these boots are versatile for both rugged trails and smoother paths.
- Heavy-Duty Backpacking Boots: Built for durability and support, these boots are ideal for carrying heavy loads over challenging terrain.
- Waterproof Hiking Boots: These boots feature waterproof membranes, making them suitable for wet conditions while maintaining breathability.
- Approach Shoes: Blending the features of hiking boots and climbing shoes, approach shoes are suitable for rocky terrains and technical trails.
Trail Running Shoes: These shoes are designed for agility and speed, often featuring a mesh upper for breathability and a lightweight construction. Their aggressive tread pattern helps provide traction on a variety of surfaces, making them a good choice for well-maintained trails and less rugged terrain.
Mid-Cut Hiking Boots: Mid-cut boots strike a balance between support and flexibility, giving hikers the ankle protection needed on uneven ground while still allowing for comfortable movement. They are versatile enough to handle both light trails and more challenging hikes, making them a popular choice among recreational hikers.
Heavy-Duty Backpacking Boots: These boots are designed to endure extreme conditions, providing maximum support for the ankles and superior cushioning for long treks. They are typically heavier and stiffer, suitable for those carrying significant weight in their packs and navigating through rough terrains.
Waterproof Hiking Boots: Featuring materials like Gore-Tex, these boots keep feet dry in wet conditions while still allowing moisture to escape. This makes them ideal for rainy weather or muddy trails, ensuring comfort and preventing blisters during long hikes.
Approach Shoes: With a rubber sole designed for climbing and a hiking boot’s comfort, approach shoes are perfect for hikers who encounter rocky or technical routes. They provide good traction on both trails and climbing surfaces, making them a versatile choice for adventurous hikers.
How Can You Ensure the Right Fit and Comfort in All Terrain Hiking Boots?
Look for boots that offer adequate cushioning and arch support to reduce fatigue on long hikes. A good insole or midsole can absorb shock and provide comfort during extended wear. This is especially important when traversing uneven terrain, where your feet require additional support.
The materials used in the boot’s construction can significantly affect comfort and durability. Leather and synthetic materials offer different benefits in terms of breathability, weight, and water resistance. Choose a material that suits your hiking conditions, ensuring your feet stay dry and comfortable.
Allow time for your boots to break in before embarking on long hikes. New boots may feel stiff initially, so wear them around the house or on short walks to help them conform to your feet. This process can prevent blisters and soreness during your outdoor adventures.
Ensure the soles provide sufficient traction for various terrains to enhance stability. Look for a boot with a lugged outsole designed to grip different surfaces effectively, from rocky paths to muddy trails. Good traction is essential for safety and confidence on challenging hikes.
What Are Common Mistakes to Avoid When Choosing Hiking Boots for Varied Terrains?
Some common mistakes to avoid when choosing hiking boots for varied terrains include:
- Neglecting Proper Fit: Ensuring the right fit is crucial for comfort and performance on hikes. Boots that are too tight can cause blisters, while those that are too loose may lead to instability and reduced support.
- Ignoring Terrain-Specific Features: Different terrains require specific boot features; for instance, rugged outsoles for rocky paths or waterproof materials for wet conditions. Failing to consider these features can result in poor traction and discomfort.
- Overlooking Weight: The weight of the boots can significantly affect your hiking experience. Heavier boots may provide more protection, but they can also lead to fatigue over long distances, making lightweight alternatives more appealing for varied terrains.
- Choosing Style Over Function: While aesthetics can be important, prioritizing style over functionality can lead to poor performance. It’s vital to select boots that meet the necessary requirements for traction, support, and durability instead of merely what looks good.
- Not Considering Break-In Time: Many hikers underestimate the importance of breaking in their boots before hitting the trails. New boots often require a breaking-in period to ensure they are comfortable and to prevent blisters during longer hikes.
- Forgetting About Insoles: Standard insoles may not provide the necessary arch support or cushioning for every hiker. Investing in high-quality insoles can enhance comfort and improve overall foot health during hikes.
- Disregarding Seasonal Adaptability: Choosing boots that are suitable for all seasons is essential, particularly in varied terrains. Boots designed for winter conditions may not be breathable enough for summer hikes, so consider the climate when selecting your footwear.
How Can You Properly Maintain All Terrain Hiking Boots for Longevity?
Using waterproofing treatments, such as sprays or waxes, helps to maintain the water-resistant properties of your boots. This is particularly important for all-terrain hiking boots, as they are often exposed to various wet conditions that can compromise their performance.
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