Socks won’t rescue a bad shoe choice, but the right pair can keep a long trail run from turning into a fight with heat, sweat, and blisters. That’s more consequential than it sounds: a sock that slips or traps moisture can make every mile harder.
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Shoes still outrank socks on my gear list for a trail run. But socks matter once your feet start heating up or shifting inside the shoe. I look for cushioning, support, sweat-wicking fabric, and a fit that won’t rub. Many of my favorites combine natural fibers with foot-specific zones: mesh where heat builds, firmer structure around the arch, and extra protection at the toes and heel.
There isn’t one right sock for every runner. Cushioning needs depend on your preferences, the weather, and your shoes. Height matters, too: a taller cuff can block grit and brush, while a low cut feels cooler and less restrictive. These are my picks for the year.
Fit the sock to the trail
Many trail socks use mesh panels in areas that tend to get warm and damp. The looser, thinner weave helps airflow and moisture escape, which can keep feet cooler and help the sock dry faster. That may reduce discomfort, odor, and the friction that leads to blisters. If you run in hot conditions, targeted venting deserves a close look. Darn Tough’s Microcrew UL Cushion is one example: it uses active zones for airflow and structure, with a thinner panel over the foot and more cushioning at the toes for padding and abrasion resistance.
For most trails, I reach for a quarter, mini, or crew height. A quarter sock barely clears the ankle; it’s a good hot-weather choice when debris isn’t a concern. A heel tab helps keep a low sock from slipping into the shoe, as on the Balega Ultraglide. An ankle-height cuff reaches the ankle bone, adding some coverage and working well with low trail gaiters; the Smartwool’s lower-height ankle socks are an option in that category.
Microcrew socks cover the ankle bone without climbing far up the leg. They’re my preferred all-around height: enough fabric to guard against sand, grit, and trail abrasion, without the extra heat of a tall cuff. Full crews reach roughly the middle of the calf and offer more protection from brush and debris. If you want a compression fit, see this guide to compression-style socks.
I change sock height with the conditions: lower cuffs for hot, clear trails; taller ones when brush or loose grit is likely. If you’re choosing just one pair, microcrew is a sensible compromise.
Cushioning and fabric
Most runners seem to land on moderate cushioning. It absorbs some impact on rough ground while keeping the sock from feeling bulky or dull inside the shoe. I keep different weights available because a short, hot outing and a long day on rocky trails don’t ask for the same thing.
Uncushioned socks have no extra padding and can suit short runs, warm weather, or highly cushioned shoes. Light cushioning adds fabric underfoot while preserving a close feel for the shoe. Midweight pairs are my usual choice: they pad the sole and reinforce the heel and toe without forcing a change to the lacing. Heavy cushioning feels plush as soon as you put it on, and some runners prefer it for long, pounding efforts.
Merino wool and synthetic fibers such as polyester and Lycra are common in trail socks. Merino helps move moisture, regulate temperature, and resist odor; Lycra adds stretch and helps the sock stay snug rather than bunching or sliding. A larger synthetic and Lycra share generally means more structure and compression. More merino tends to feel softer and resist odor better.
Natural and synthetic fibers work well together. Merino, and increasingly alpaca wool, can feel comfortable against skin and help manage odor during long outings. Synthetic yarns add stretch, shape, and durability. A fully synthetic sock may be sturdy but less effective against odor; a fully natural one may feel soft but wear out sooner.
Most reputable trail socks cost about $18 to $24 a pair. Multipacks can be cheaper and suit some runners, but I haven’t found many inexpensive pairs I trust to keep feet cool and blister-free. That’s a real drawback for a category where you may want several weights or heights on hand.
Cotton can work for some runners, but it’s not what I recommend for trail use. Purpose-built socks combine cushioning and support with wicking fibers, a breathable fit, and less tendency to shift against the foot. Those details help limit rubbing when your feet get sweaty.
Look for a light or midweight sock with extra protection at the heel and toes. It should sit close without squeezing, and there shouldn’t be spare fabric folding at either end of the foot. Many trail socks use a foot-mapped knit, with less material over the arch and top of the foot while retaining support and protection where they’re needed.
How I tested this year’s picks
I’ve spent more than a decade trail running, hiking, backpacking, and thru-hiking, and have tested outdoor gear professionally for nearly as long. To narrow the field, I started with my experience in the category, then wore the candidates on trail runs. For this update, I revisited notes from the past year’s runs, hikes, and outings that mixed the two.
Lé Bent’s 3/4 Crew Trail Sock emerged as a new favorite, while the Balega Ultraglide returned to regular use. I also considered feedback from Runner’s World editors and testers, whose climates and foot needs differ from mine, along with the original testing for our overall best running socks article. I selected a range of heights, weights, and materials. Each pick fit true to size, moved sweat, dried quickly, and offered support that helped reduce blister risk.
The socks that stood out
Lé Bent’s updated line changed my ranking this year. Its Targeted Cushion 3/4 Crew replaced last year’s top pick, and the reason is straightforward: it combines underfoot padding with a snug arch and a heel that stays put. The sock is made for longer trail outings, with extra cushion under the forefoot, a tighter weave through the arch, and reinforced heels that don’t bunch.
A proprietary fit system varies the sock’s weight and structure across the foot, producing a close fit that doesn’t feel tight. The three-quarter crew length gives me useful cover on overgrown trails and around debris, yet stays comfortable in warm weather. It also vents and wicks well enough that I didn’t notice my feet getting hot.
The blend includes 30 percent rayon, a bamboo-derived fiber that feels soft alongside merino, plus nylon for durability and 4 percent elastane to help the sock keep its shape across repeated wears. The fabric feels silky, and the cuff hasn’t stretched or slipped down on me. This pair surprised me; after testing it, the top spot feels earned.
Darn Tough’s Microcrew UL Cushion is an ultralight, stretchy option sold in three heights. I use the no-show or quarter crew when debris is unlikely, and prefer the 7.5-inch microcrew when I want more coverage. That taller version adds a little compression and helps keep dirt out.
Its merino and synthetic blend is built for warm-weather breathability. The socks haven’t slid down or gathered at my ankles, and Darn Tough reinforces the main contact points. The knit between foot and ankle is thinner, which cuts down on pressure as the foot flexes. There’s less merino than in some of the brand’s thicker or hiking-focused socks, but that helps airflow while retaining some softness and odor resistance. Four percent elastane supports the fit without making it feel tight.
For a lower cuff, Darn Tough’s Light Hiker Quarter balances durability with more padding than I expect from a pure running sock. Its fabric is mostly synthetic, including 52 percent nylon, which helps it hold its shape and resist abrasion. The light-cushion label understates the padding at the heel and toe, and the build feels suited to longer days on foot.
The cuff rises about an inch above a low-top running shoe. It looks streamlined and stays in place, while offering some protection from grit—though a microcrew or quarter crew covers more. The tighter structure extends above the heel for Achilles support, and the mesh across the top of the foot is more closely woven.
Smartwool’s crew socks were among my highest-rated this year, and I kept wearing them into spring. Their heavier blend holds warmth for snowy runs, but mapped knitting through the foot and cuff still lets them breathe. I wore them in winter conditions and on a 60-degree trail run without overheating.
Earlier versions of Smartwool socks could stretch out through the upper and lose cuff elasticity. The company’s revamped Indestructawool knitting has largely addressed that in my experience, helping merino keep its shape and improving the fit. I wouldn’t choose these for the hottest days, but they work well across cold and shoulder-season conditions.
Balega’s Ultraglide has stayed in my rotation for years. Its thick padding and reinforced heel tab have held up without obvious wear or stretching. The sock uses the brand’s soft Drynamix synthetic, spun to reduce friction against the skin, and has handled hot weather, creek crossings, and off-camber trails where my feet move inside the shoe.
Strategic cushioning supports both the top and bottom of the foot. Seamless toes and heels reduce rubbing, while vents across the top help keep feet from getting too sweaty. The low cuff leaves only a small heel tab above the shoe. I’d skip this style if debris is a concern, but on cleaner trails it feels freeing and works well with a close-fitting shoe collar. Though some call it low cushion, I’d put it closer to medium: there’s extra material at the toe and more heel support than in my lightest socks.
Minus33’s ankle socks fill the gap between a no-show and a full crew. Their cuff rises about two inches above my shoe, enough to keep out dust and dirt while still feeling light. The fabric is 59 percent merino; it wicks and feels soft, and I haven’t found the thicker sole too warm.
The arch stretches without bunching, and the combination of a short cuff and substantial cushioning works well for hot days with long descents. The sock uses thinner material at flex points and extra padding at the heel and toe. My one complaint: the toe can feel bulky. Still, the pair is well made, reasonably priced, made in the U.S., and has shown no wear after more than a year.
About the tester
Maggie Slepian is a full-time freelance outdoor writer who has tested gear professionally for almost ten years. She’s a trail runner, backpacker, bikepacker, and horseback rider, and has thru-hiked thousands of miles on the Appalachian, Colorado, and Ouachita trails. Her backcountry experience spans coastal routes, desert terrain, and high alpine peaks. Her work has appeared in New York Magazine, Huffington Post, REI, and Outside. She’s a columnist for Backpacker Magazine and co-founded BackpackingRoutes.com. Contact her at MaggieSlepian.com.
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