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WEERTI Thermal Underwear for Men features a premium fleece lining and four-way stretch fabric that locks in warmth while providing breathable moisture-wicking comfort. Designed as a versatile base layer, it excels in cold weather conditions, offering all-day softness, odor control, and unrestricted mobility. Highly rated and a top seller, it’s the go-to choice for professionals and outdoor enthusiasts seeking reliable warmth without bulk.








| ASIN | B088K2GKNX |
| Best Sellers Rank | #23 in Clothing, Shoes & Jewelry ( See Top 100 in Clothing, Shoes & Jewelry ) #1 in Men's Thermal Underwear Bottoms |
| Customer Reviews | 4.5 4.5 out of 5 stars (12,700) |
| Date First Available | May 13, 2020 |
| Department | mens |
| Manufacturer | WEERTI |
S**E
Husband Approved!
These thermal underwear are fantastic. They’re soft, fleece-lined, and do a great job keeping warmth in without feeling bulky. My husband wears them to football games in cold weather and stays warm and comfortable the entire time. They fit well, layer easily under clothes, and hold up well after washing. Definitely a must-have for cold weather and outdoor events.
C**M
Nicely does the job!
I am 6'1" and 245 lb and got myself 3XL (XXXL) and fit perfect. Feels perfect and also does the job perfect for me. Please don't hate me but I am a CA bike rider and for us in here when weather goes below 50F we feel like exploring Antarctica on our bikes. I've worn these during a trip here in CA and for a few hrs I was exposed to 42F weather and didn't shiver nor sweating. But I was comfortably warm under just atypical motorcycle jacket (not a very high quality) and a thin layer of turtle neck made out of a light material. So it may not be the best one in the world but definitely the best one for the money! Again, if you're riding in North Dakota winters it may not be sufficient for you but it is great as a base layer that helps you to stay warmer in 40F kind of weather at 70 mph on a bike!
S**U
Great cold weather thermals that protect you from the cold and wind.
Got these for colder weather and wear under my clothing when walking/jogging outside in 10-30 F degree weather. After about a month and 7-8 uses and washes I am very impressed. They hold heat in great, good material and quality and after some washes they have not had the lent balls attach to it which is always a concern with this type of material. Has not shrank but it does run tight which is what I wanted, as I am 5' 10' 225 and decently muscular and bigger chest and got a XXL. Fit tight in a good way and I had no issues even weight lifting in these. I sweat a ton and these held the moisture and kept me warm when I hit the parking lot at 25 degrees and windy. I will be buying 2 more sets and rotate them so as not to wash this set to death. Very pleased with them, wish they were about $5 or more dollars cheaper as some others but assume they might not have the quality I find with these.
T**S
Very soft thermals
The packaging was great. The thermal underwear came in a nice box with the thermals in an airtight bag inside. The black color was rich and it appears to be very durable. They are not too thick and feel very soft. They are for my son and he felt that they fit very well and they are very warm and comfortable.
S**N
Great base layer that works even below freezing. Remember to layer up!
These are great for sub-freezing temperatures. I just wore them to the Patriots game at Gillette stadium where we sat up on the 300's level in the freezing wind. There was a wintry mix with the temperatures dropping down to 15-20 degrees F during the 2nd half of the game, with the "Feels-Like" temperature of 0. That being said, I was super warm and even a little hot with these on as a base-layer. I would say the shirt was a little tight but the pants fit great - then again, as the base layer you don't want these to be loose or bulky, so that may be good. I'm 5'10 200 lbs and I got the Large size.
W**M
Cozy and fits wonderfully under clothes.
Awesome. This is my first pair of long John’s I’ve owned and it’s a game changer this cold winter. It’s warm and cozy as an undergarment, the color is sleek for my work uniform, the lining is sturdy, and the length of the underwear make it to where it doesn’t ride up on my pants when I wear it which makes it super comfy. Good product for someone who works in the cold a lot.
J**C
Great quality and warm
I'm 5'10" 205 and the Xl fit great and they are warm. The fabric feel really good on my skin. Temp was 40 degrees today and breezy, wore the shirt under a thin hoodie and didn't feel any wind on my skin. Should be great once layered in cold weather. Nice set.
J**N
Most comfortable long underwear we have ever warn!
Excellent long underwear. They fit perfectly and are very comfortable, light weight but warm. Both my wife and I are sold on these long johns.
M**S
De buena calidad y cómodos.
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