Best Athletic Underwear for Men of 2026

"I gave these to my husband, a heavy equipment operator working outdoors in brutal winter conditions, and he’s practically lived in them ever since. He says he’s always the perfect temperature, needs fewer layers, and appreciates the odor resistance and lasting fit. Even after tough use, these merino layers stayed comfortable, didn’t stretch out, and provided enough length to keep his back covered during repairs in harsh wind. We’ll definitely buy more sets in different weights for versatility."

"As someone who struggles with cold, I was amazed at how these thin, soft layers kept me warm down to 25°F while running. They fit perfectly, are super lightweight, and feel great against my skin. I’m planning on getting another pair just to have on hand."

"I’ve worn this set for two years, even in the coldest winter days riding my motorcycle. The quality is outstanding—it keeps me warm in 20°F weather, withstands regular washing, and hasn’t lost shape despite hang drying. Yes, it’s expensive, but absolutely worth it for the performance."

"I always bring these when temperatures drop. They're impressively warm without being bulky, making them my top choice for cold runs and winter hikes. The moisture-wicking fabric truly keeps me dry, and the stretchiness means they never pinch or ride up. While they're pricier than other options, the comfort and performance make them worth every penny if you need reliable cold-weather gear."

"After testing these in Chicago's freezing temperatures, I was impressed with how warm and comfortable they kept me—even while walking around outside for hours and attending a football game. The fit is spot-on, and the compression really helps retain body heat. For the price, the durability and quality are excellent."

"As a year-round outdoor runner, I rely on these as a base layer when the temperature dips into the 20s and below. They're warm, fit comfortably under shorts, and work well for all sorts of cold-weather activities. Definitely a staple in my winter running gear."

"I wore these on a 3-day hunting trip in freezing, snowy conditions and stayed warm and comfortable the entire time. The fit was perfect for layering—snug but not tight. Plus, they're soft to the touch. Definitely recommend for anyone needing reliable warmth!"

"I bought these for my husband who works outside in cold barns daily. He absolutely loves them. The length is ideal, the material is stretchy and very soft, and even after a month of frequent washing and heavy use, they still look and feel great. Exceeded our expectations! My only minor wish is for more color choices."

"As someone who is 6'2" and 200 pounds, I found the fit to be comfortable—not skin tight but not baggy either. The quality is top-notch and they keep me very warm. Honestly, they also make for amazing pajamas! Definitely worth every penny."

"These thermals are super warm yet breathable, and the fit is just right. I’m impressed with how comfortable the material feels, and I’d definitely recommend them to anyone needing extra warmth!"

"As someone who works outside all day, I appreciate how these keep me warm without overheating. The soft inner lining and slim fit make them ideal as a base layer. I’ve bought more because they’re just that good."

"I got these for my husband, who spends hours outdoors, and he says the material is buttery soft and light, yet it keeps him cozy and comfortable. The sizing is spot on, making it a great choice for anyone working in cold conditions."

"I recently moved from the South to New England, and these Under Armour ColdGear shirts have been a lifesaver for warmth and comfort. I used to be cold all the time, but now I can stand outside in freezing temperatures longer than locals—even with just a sweater layered over. They’re pricier, but absolutely worth every penny if you spend lots of time in the cold."

"As a runner and skier, I love this shirt for its exceptional insulation and breathability. It keeps me warm even in 15°F weather with high winds, especially when paired under a light windbreaker. The internal lining is soft, the fit is excellent, and the materials feel premium. I’m making this my go-to base layer for all my winter activities."

"For winter golf, this Under Armour fitted top is a perfect base layer. It’s lightweight, fits well, and moves with me, keeping me comfortable throughout my game. I appreciate the quality and how it keeps me warm without feeling bulky."

"I'm constantly outdoors for football games in harsh winter conditions and these thermal underwear are a must-have for keeping warm and comfortable. The fleece lining feels soft, and they are easy to layer under other clothing without adding bulk. I’ve washed them several times and they hold up really well."

"As a CA motorcycle rider, I need a base layer that keeps me warm when temperatures dip. Even riding at 70 mph in 42°F weather, these thermals have been fantastic for comfort and warmth under my jacket and a light turtleneck. Fit is perfect in 3XL, and the price is great for the quality."

"I bought these for exercising outside in 10-30°F weather, and after multiple uses and washes, I’m very impressed. They lock in heat, wick moisture, and haven't developed lint balls. The fit is snug but ideal for athletic builds, and I can even lift weights in them. Planning to grab two more sets!"

"When I wore these merino wool base layers during a golfing session in 40°F windy weather, my legs stayed perfectly warm and comfortable—never too hot, never too cold. I’ve tried many long johns living in a northern climate, and these are by far the best I’ve ever owned. The fit was spot on for my 33” waist and 32” inseam (size medium), and even under thin golf pants, I felt the difference. Snug without being tight and incredibly soft, these are now my go-to base layer."

"As someone who rides motorcycles and works outdoors in the cold, I picked up the medium black 250 and it’s been ideal for chilly rides and workdays. At 5'10" and 180 lbs, the fit is a touch loose but the length is perfect. Even after two years of regular use, there’s only a minor hole at the ankle. Warmth, durability, and quality high socks—these base layers deliver serious comfort and value."

"I wore these on a trip to Antarctica, and I was actually almost too warm at times! Layered under waterproof bibs in 30°F, they kept me toasty the whole time. Even when I switched to hunting in Michigan, they became my essential layer for real cold. They’re thin enough to fit under anything and don’t cause overheating—a total game changer for extreme weather."

"I've worn these since October, including during a marathon. The comfort is unmatched, and the side pocket fits my phone or snacks perfectly. For long runs, they're incredibly convenient and durable."

"As someone who plays golf and battles 'chub rub,' these shorts are a lifesaver. No more chafing or awkward waddling—just smooth, breathable comfort that keeps everything in place. I can't recommend them enough for anyone dealing with thigh friction."

"After buying these, I noticed the fit is just right—supportive without being too tight—and the fabric is soft, stretchy, and highly breathable. They're perfect for any workout, staying in place without riding up or slipping down."