Best Base Layers for Men of 2025

“The fit is just perfect for me. It’s nice and thick, very comfortable, and appears to be made well. Although the cost is high, I believe it’s a good product. I wear these under my thin uniform pants and stay comfortable, even when I’m outside 50% of my time for work in Wisconsin.”

“I bought a size Large for my boyfriend, and it's not too thick, which is wonderful. It fits perfectly and keeps him very warm on cold days. The value and quality are great! It's very soft, and I will definitely buy again.”

“I recently traveled to Finland and faced temperatures around -5°C with wind and snow. I must say, this base layer worked like a CHARM! It kept me warm and fit perfectly, without looking baggy under my clothes. It was truly worth splurging on this set.”

"As a native Californian in LA, I lack experience with long johns. But if this is what winter wear is like—soft, warm, breathable, and stylish—then I should definitely embrace this 'winter' thing more often! The fit is good; standard sizing, perhaps a bit trim, which is ideal for layering. See, I sound like a pro, right?"

"I bought these for my son and washed them in the machine before drying. They came out perfect, and he adores them! He wears them as an under layer every time he leaves home and finds them very warming and comfortable. He even asked me to get him another set, so it's clear he really likes them!"

"I've owned about four pairs of thermals, but these are by far the best. I took them to Iceland in November, and they did their job splendidly—warm, comfortable, and a good fit!"

"My husband adores this base layer! It's thin yet warm, and I love that it’s long enough when I choose the tall size!"

"I found it to be very comfortable and I appreciate the thumb hooks for slipping my arms through a jacket easily."

"At first, I bought a large size since that’s what I usually wear, but I had to exchange it for a medium. The quality is impressive, and it keeps me warm during walks in chilly weather."

"I'm 5'11 and 185 pounds. I ordered a large size, and they fit perfectly. I plan to use them as a ski base layer later on."

"My husband is going to LOVE these Spyder long underwear. They hold up wonderfully—definitely a great product!"

"I really enjoy this base layer set. The sizing is spot on, and the fabric is incredibly comfortable. They're perfect for wearing around the house or outside. They kept me nice and toasty while I cleared my driveway in a fierce snowstorm!"

"I recently bought these thermal compression shirts for coyote hunts, and I'm really impressed! The fabric is soft but durable, providing great insulation without being too bulky. The shirts fit snugly but are not restrictive, and they do an excellent job of keeping me warm during runs in cold weather. The long sleeves offer full coverage, and the compression design helps with muscle support. I've worn them both as a base layer under my jacket and on their own, and they perform really well. The 5-pack is a great value, and I've been rotating them regularly. These shirts are perfect for winter sports and outdoor activities. Highly recommend!"

"With winter already here, my hubby needed thermal wear ASAP. We came across these, and they delivered. The quality is thick and soft but not bulky. They were washed before being worn, and they did not shrink, which was very important. The material is stretchy and very comfortable. They added warmth without being unbearably hot, so their functionality is on point. We highly recommend!"

"This fleece-lined product is extremely warm and feels durable for a really good price. If you're on the fence with sizing, go a size up. It's not bulky, but it's also not thin. Really good purchase for what it costs."

"I wore this during a snowstorm at Breckenridge over Christmas. It's snug but not tight, and definitely not a compression shirt. I felt warm, and the mock turtleneck kept the snow and chill out even in whiteout conditions. Plus, it's nice and long, so it stayed tucked in while I was shredding. I'm 5'11" and 170, and the medium was the perfect choice for me."

"These shirts are fantastic! They fit comfortably and keep me warm during winter, whether I'm layering under athletic clothes or wearing them beneath a sweater. I'm so pleased that I'm planning to buy more in different colors."

"I absolutely love this ColdGear wear. It keeps me warm even while jogging in subzero temperatures. I have an older Under Armour ColdGear piece that has lasted over 15 years, and while I wish the newer ones had a dual color option, the quality remains exceptional."

"I found these thermals to be incredibly soft on the inside and durable on the outside. They fit true to size, though a bit snug for my taste. This is my second order, and it definitely won't be my last!"

"Initially, I wasn't expecting much given the price, but I gave it a shot based on reviews. It turned out to be a great thermal base layer. It's lighter than expected, but fits perfectly and isn't too compressive. Time will tell how it holds up, but so far, it's a fantastic value."

"I specifically got this for a cold football game, and I was pleasantly surprised. The temperature wasn't an issue at all. It’s soft, fits well, and has washed nicely. A great buy and definitely a value!"

"I was pleasantly surprised by this shirt. It's one of the most comfortable long sleeve shirts I've ever worn! I plan to buy more!"

"As someone who’s 6ft and 185 pounds, I found the XL fit me perfectly. It’s a great thin layer for cycling or skiing, and I like the length for tucking in."

"I expected less from this product, but it turned out to be soft and high quality. It’s a really nice under layer, and I’m happy with my purchase!"

"I ride my bike a lot, and these thermals have truly impressed me. They stay in place, are breathable, and have kept me warm even in the coldest conditions. They’ve held up well through weeks of riding without showing any signs of wear. Well done!"

"Living in Montana, we experience a lot of snow, and my partner is always cold. I bought these for him, and he absolutely loves them. They fit perfectly and keep him warm and comfortable. Great value for two pairs, and the quality is impressive!"

"My son works in a fast food restaurant and often goes outside in winter. He needed something that was form-fitting, professional, and WARM. This thermal set checked all the boxes! The fit is great, and it’s very comfortable. We’ve always been happy with the Spyder brand quality."

"I found these to be light, warm, and moisture-wicking. They are just perfect for my winter walks."

"I tested these in 20mph winds and light rain. The temperature was 42 degrees, and after 46 miles in an unheated UTV, I never got cold. I got a little wet, but overall they worked great as an inexpensive insulated underwear. Plus, they have a slot for easy relief—awesome!"

"The quality is pretty good. The fabric feels soft, but it does seem a bit thin for something labeled as ‘performance cold weather’. This may just be my personal preference. They’re great for sleepwear, though. The fit is tight; I’m 5'6” with a medium build, and I went with a size medium."

"The texture and fit are very good, making me feel natural and comfortable. I'm really satisfied!"

"Overall, this seems to be a decent quality product. However, I noticed some peculiar sizing. The long johns fit perfectly, but the top is about two sizes too big on my 49" chest, and the arms are 5 inches too long, hanging down to the middle of my fingers. Both items are labeled as 2XL."