Best Base Layers for Men of 2026

"I was really impressed with how incredibly warm and comfortable these thermals are, even though the material is pretty thin. The fit is perfect under regular clothes, and they don't feel bulky at all. I love the soft feel and solid quality—I would absolutely recommend them!"

"I ordered these for my husband’s work shifts in the cold, and they kept him warm just as promised. The stretchy waistband and soft microfiber interior make them comfortable for all-day wear. Just be careful with sizing—I went up a size for a better fit, especially since the top was a bit more fitted than the bottoms."

"My son works outside in the winter, and he says this set is cozy and warm enough that he doesn’t need multiple layers anymore. He was really happy with it as a gift and wears it regularly for outdoor work."

"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."

"Since moving to New England from the South, I've found these shirts to be incredibly warm and comfortable, making it possible for me to handle freezing temperatures much better than before. They're easy to clean and even though they're a bit pricey, the value in cold weather is undeniable."

"As someone who enjoys winter running, I love that this shirt offers impressive warmth with breathability thanks to its internal insulation layer. The fit is excellent, materials feel premium, and it keeps me dry even when I sweat. It's become my go-to base layer for both running and skiing."

"The Under Armour ColdGear Fitted Mock is like a hug from an old friend—the fit is reassuring and stylish, and the ColdGear tech keeps me toasty no matter how cold it gets. The mock neck adds a touch of class, making me feel ready for any winter adventure."

"I picked up two pairs for my son, who works outdoors, and he says they're very warm, soft, and comfortable. The XL size fit him perfectly at 6 feet and 240 lbs—definitely true to size. I’d recommend these to anyone needing reliable warmth."

"As someone who’s a 42 long, the large size fits me just right, especially the top. The thermals are nicely soft and have good thickness for layering. I plan to order a few more sets because they’re just that comfortable."

"These thermals keep me warm and cozy through cold, windy days. I’ve been wearing them for a second winter now, but they do need a bit of extra care—delicate wash and hang to dry. Still, I’m happy with how comfortable and effective they are."

"I've purchased several of these shirts over the years and the latest versions are much thicker, warmer, and stronger than before. They don't pick up odors and hold their shape well. The limited color selection is nice, though I wish the logo was removable. Overall, great value for winter clothing and I’ll definitely buy again."

"I wear these merino wool tops and bottoms as my go-to base layer when the temperature drops. They're thin, lightweight, and keep me warm without overheating indoors. The material is comfortable, absorbs moisture, and resists odor, so I don't have to wash them constantly. They're not the cheapest, but for cold weather, they're absolutely worth it."

"This was my first time trying merino wool, and I'm impressed. The shirt is soft, not itchy, and perfect for layering on winter hikes. It keeps me dry and comfortable without sweating issues. The free socks were a nice bonus, and although they're thinner, they kept my feet dry. I highly recommend this product for anyone facing cold weather outdoors."

"The warmth and comfort these provide outdoors are fantastic—I work outside and even on the coldest days, I stay cozy. They might cost a bit more, but the quality makes it worthwhile."

"I can't stand the cold, so I use these for layering whenever the temperature drops. They're incredibly comfortable and keep me warm all day."

"These base layers are impressively warm despite being so thin. I use them under my jogging pants for outdoor workouts around freezing temperatures, and my legs never get cold. They're also well made and feel great."

"I've found this baselayer top to be very warm and comfortable, with enough length to stay tucked or protect my hips from cold drafts. It's breathable enough to wear indoors, which helps me keep my heating costs down. Quality is excellent, and it’s definitely worth the investment—so much so that I bought a second one to avoid being without it during laundry day."

"This is the softest, most comfortable wool I’ve worn directly against my skin. It’s thin, not bulky, and keeps me nice and warm when layered. At 5'8" and 170 lbs, the medium gives me room to layer, though a small would fit too."

"I needed a solid base layer for my husband’s long hours outdoors in the fall and winter. We trust Smartwool, and this underlayer exceeds expectations—much warmer than the lighter 150 version he used before. Highly recommend for cold conditions."

"I was really happy with how these kept me warm while camping in December. The fabric is soft and durable, and after washing them a couple of times, they stayed in great shape. I’d definitely buy them again."

"These thermals are true to size and lightweight, and I found them super comfortable and soft, even after a few washes. The arm and leg lengths fit perfectly for my frame (6’, 165 lbs, 32” waist)."

"I noticed the sizing was way off; the 3XL I got was much larger than expected and didn't fit at all, even though that's my usual size. It was disappointing, but maybe someone else can use them."

"My son needed something to keep him warm in unexpectedly cold weather in Orlando, and these thermals were perfect. The medium size fit him just right, and he mentioned that they're super soft, cozy, and breathable—no sweating underneath. I was happy to see they washed well without any issues. I’m considering ordering a pair for myself for chilly nights!"

"I wore these thermals during a trip to Zion in March and found them ideal for hiking thanks to their lightweight and breathable fabric. They’re so comfortable and soft that I keep using them as both base layers and everyday wear now that I’m home."

"I’m wearing this thermal set right now, and I love how comfy and affordable it is. The large size fits loosely just the way I like, and it keeps me warm without overheating—a big relief since I was miserable from the cold earlier."

"I've been really impressed by how comfortable and warm this shirt is, especially with the thumb holes that keep the sleeves in place. The fit is just right, not too tight or loose, and the material feels great on my skin. I do wish there was a little more information about how to launder it, but overall, it's definitely worth the purchase!"

"Honestly, this is the most comfortable base layer shirt I've owned. The fit is relaxed yet warm, and the waffle pattern looks great. I find myself wanting to wear it every day. Once I reach my weight goal, I'm planning to buy several more because the material, build quality, and price are outstanding."

"I use this shirt for ebike rides in cold weather, and it's perfect for layering. It fits true to size, and the thumb loops are a great touch. While the fabric is lighter than I expected, it still keeps me warm, and I really appreciate how easy it is to wear under other clothes."