Best Thermal Pants for Men of 2025

"My 20-something son loves these! The medium fits perfectly. He’s 5'10 and has a lean build. They provide a good weight for keeping warm outdoors without overheating indoors."

"So far, these are the most comfortable and warm thermals I’ve owned! They say don’t buy cheap thermals, and I agree. Totally worth the money! I’m ordering another set!"

"I'm 6'3 and around 285 lbs. Following the size guidelines, these fit me well. They’re a bit loose around the ankles, but I’m very happy with the overall price, fit, and quality."

"This is an excellent product. The material has just the right feel and weight — not too thick or thin, not too hot or cool, stretchy but not overly so. The garment appears to be well constructed; the stitching is flawless. I'm 5'9" and 165 lbs, and size medium fits perfectly. Extremely comfortable and the price is definitely right. Highly recommended."

"I wasn't expecting much for the price but decided to give it a shot based on reviews. It ended up being a great thermal base layer. It's on the lighter side, but that's exactly what I was looking for. Not too compressive, and it fits perfectly. I'll see how it holds up over time, but it seems like a great value."

"I'm 6'2” with a 38 inch waist and got the XXL. I'm glad I did; it's just long enough and the material is fantastic. I stay warm when it's really cold, but I don't start sweating when the temperature rises to 60 degrees."

"These thermal compression pants have truly transformed my athletic wear collection. They provide a wonderful combination of style, comfort, and warmth. Their fleece lining keeps me cozy during outdoor activities, making them my go-to choice for chilly days."

"I find these pants to be perfectly warm for my motorcycle rides on cold days. The fit is excellent, and the overall construction feels very sturdy."

"I absolutely love how comfortable these pants are! The moment I put them on, I felt the warmth enveloping my legs. I prefer not wearing multiple layers, so these have been a great choice for me, and I'm even considering getting more!"

“I recently ordered the Fruit of the Loom Long John Bottoms in XXL. I knew the XL wouldn’t fit due to my large calves and thighs. These provide plenty of room and come up to my waist nicely. They’re warm and comfy; I’ll definitely buy them again.”

“I love how these fit—they're cozy and keep me warm without being too big or small. The quality, texture, and color are just right, and they’re worth every penny! No complaints here.”

“These long underwear are comfortable and warm enough for near-freezing temperatures. I chose them because they were affordable, and so far, they’ve exceeded my expectations for cold nights.”

"I received a pair that didn't survive the first wash, but I contacted Amazon, and they promptly sent me a replacement. The new pair fits well and held up in the wash. Great job, Amazon!"

"I purchased these long johns for my husband, and he finds them very comfortable and warm. He loves them so much that he ended up buying two additional pairs!"

"These long johns fit well at the waist and buttocks, but I found the legs to be too narrow and tight for my body type. I appreciate the accurate photo representation, though, and returned them for a quick refund."

"I absolutely love how comfortable these feel on my skin. They make a great base layer and fit perfectly. I appreciate that they aren't too hot to wear indoors, but I can definitely feel the difference when I step outside into the cold."

"These are a fantastic alternative to traditional long johns! They are very comfy and lightweight, making them perfect for wearing under my jeans. On extremely cold days, I still opt for the old-fashioned long johns, but these are my go-to for most occasions. Great product!"

"I purchased the Medium size and they fit perfectly. The quality is excellent! My husband also enjoys wearing them; he finds them comfortable and warm."

"I wore these for the first time and couldn't be happier! The 100% merino wool is top-notch, and the workmanship is stellar! They washed and dried beautifully, with no wool shrinkage. The fit is perfect, and unlike many long johns, these cover my ankles completely, eliminating cold spots. I didn't experience any ‘wool itch’ and felt comfortable all day, regardless of the weather. Plus, they’re adorable! I plan to wear them for evening beach walks. I’m 5'6” and chose a small size. Expensive, yes, but worth every penny!"

"I usually stick with Smartwool, but I was super impressed with these! They are soft and well-made, and I can’t wait to see how warm they are when I put them to the test. The price and quality are exceptional!"

"I had my doubts about the durability of these thermal pants, but they have proven to be very comfortable and true to size. They keep me warm when walking my dog, although they are a bit on the expensive side. Still, I believe you get what you pay for!"

"I find these long johns to be nice and warm, and they don't stretch out like others I've tried."

"I think this product is great for winter weather; it really helps me stay warm."

"I haven't worn it yet, but it fits well, so I'm sure it will be just fine."

"I bought these for my husband after he complained about not having clean long underwear. He loves these comfortable and lightweight long johns, and they keep him warm in the snow and wind!"

“I really enjoy these lightweight thermals that help me stay warm without feeling bulky. Even in the teen temperatures, they do a great job, and I can wear them comfortably under my jeans. I’ve had some for years with no wear or shrinkage, but I do wish they were a bit longer.”

“I love these thermals! They fit well, are not too clingy, and provide a great layer of warmth for most winter days. I was pleasantly surprised by their breathability and wicking properties. Definitely a recommended buy for anyone needing a good base layer.”

“I initially bought these for lounging at home, but they turned out to be perfect for going outdoors too. The soft, stretchy fabric and comfortable fit make them ideal for wearing under jeans. The fly is a nice touch, and I'm really happy with my purchase overall.”

"I was searching for lightweight long underwear to wear under my dress pants or yoga pants in winter. These provide the perfect warmth when I start my car, yet are light enough for all-day wear at work. Just a tip: if you have a borderline 34-inch waist, consider ordering a size up. Mediums are usually fine for me, but these were too tight. The large fits just right!"

"Working the graveyard shift by the beach, these are a lifesaver during the cold, damp fall and winter. They fit perfectly under my uniform without overheating me, just enough to keep the shivers away. I was so impressed, I bought a second set. For the price, they're definitely worth it!"

"I bought these for a ski trip to the Swiss Alps. They're incredibly lightweight and comfortable, yet kept my husband warm. He prefers these over his thicker Hot Chillys, which were too warm under snow pants and cost more. The quality is excellent for such a great price, and I plan to buy more!"