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WEERTI

WEERTI Thermal Underwear for Men Long Johns with Fleece Lined Base Layer Men Cold Weather Top Bottom

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Availability: In Stock.
Fulfilled by Amazon
Arrives Thursday, Jul 9
Order within 9 hours and 56 minutes
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Size: X-Large


Color: Black


Department ‏ : ‎ mens


Date First Available ‏ : ‎ May 13, 2020


Manufacturer ‏ : ‎ WEERTI


Product Warranty: For warranty information about this product, please click here


Best Sellers Rank: #5,990 in Clothing, Shoes & Jewelry (See Top 100 in Clothing, Shoes & Jewelry) #1 in Men's Thermal Underwear Bottoms


#1 in Men's Thermal Underwear Bottoms:


Customer Reviews: 4.5 4.5 out of 5 stars (13,831)


Brand Name: WEERTI


Number of Items: 2


Age Range Description: Adult


Unit Count: 1 Count


Fit Type: Snug


Sleeve Type: Long Sleeve


Neck Style: Crew Neck


Fit to Size Sentiment: Positive


Sleeve Length Description: Long Sleeve


Apparel Closure Type: Pull On


Material Type: 92% Soft Polyester, 8% Spandex


Fabric Type: 92% Soft Polyester, 8% Spandex


Apparel Fabric Weight Class: Lightweight


Apparel Fabric Stretch: High Stretch


Product Care Instructions: Machine Wash


Color: Black


Pattern: Solid


Collection Name: Winter


Style Name: Classic


Size: X-Large


Garment Size Country: United States


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Thursday, Jul 9

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Top Amazon Reviews

    • Warm, Snug, and Better Than I Expected
Size: Medium Color: Black
I grabbed these WEERTI thermal long johns for cold days and they’ve honestly become my default base layer once the temps drop. The inside fleece is very soft and cozy, and the fabric has enough stretch that I can move around, bend, and sit without feeling restricted or like the seams are fighting me. They fit close to the body, more like a second skin, which helps keep warmth in, but it also means you may want to size up if you’re between sizes or don’t like anything too tight. I’ve worn them under jeans and work pants outside and also just as loungewear at home, and they’ve kept me warm without getting overly sweaty thanks to the moisture‑wicking fabric. They’re not perfect, though. The waistband and cuffs can feel a little snug after a full day, and if you run hot or spend a lot of time indoors, you might find yourself getting warmer than you’d like. The material is synthetic, so if you’re used to merino wool base layers, this won’t feel as “premium,” but for the price it’s hard to complain. Overall, these are a solid, comfortable option for everyday winter wear, especially if you just need something dependable for walking the dog, commuting, or working outside in the cold. ... show more
Reviewed in the United States on March 4, 2026 by Schen
    • Great Quality and Keeps You Warm
Size: Medium Color: Black
The fabric is soft, comfortable, and fits nicely on the body.
Reviewed in the United States on April 17, 2026 by Melva Lalvay
    • Perfect base layer staple for your closet!
Size: Large Color: Black
Great set of thermal undergarments. My husband wore these as a base layer while traveling to Canada/Alaska and they kept him warm in averages of 30 degree weather. At the same time they didn’t make him overheat or feel suffocated. The smooth, stretchy material is a plus because it was comfortable to wear for long periods of the day. Highly recommend for this price point and makes it easy that it comes as a set! ... show more
Reviewed in the United States on May 27, 2026 by kayla kingston
    • Quality material and performance at a fairly Reasonable Price!
Size: X-Small Color: White
Product-wise, this underwear set fits the bill! Feels comfortable, the inner polyester material feels warm, fit great even under a pair of looser jeans (not so sure how they would fit under skinny jeans lol). Size-wise, definitely go at least one size SMALLER than you would normally get. I think the size chart is misprinted, I believe the waist size is listed as the chest size, which will definitely throw you off. I actually went two sizes down from a Medium to an Extra Small, because I wanted to make sure the top and bottom of the underwear set would hug closer to my skin for heat retention, and they don't feel too tight after the 1st couple of times wearing them! Price-wise, I think it's fairly reasonable for the quality and performance the underwear set provides, and compares to most of the long underwear sets I researched on Amazon. 4 out of 5 stars is my honest rating, and I would certainly buy another pair in the future. ... show more
Reviewed in the United States on January 22, 2026 by Scott A. Brand
    • Great product and pricing
Size: Large Color: Charcoal
Light weight..fits well....keeps you warm...even in chilly home
Reviewed in the United States on May 24, 2026 by larryd
    • Sooo Comfortable, fit great, and work for really cold weather!
Size: X-Large Color: Black
These WEERTI thermal base layer underwear is by far the best base layers I have ever purchased. Perhaps they have been too good because I always wear the top under my flannels as I work in an unfinished part of my house that does not have central heating for a few days a week. I meant them to be for running outside in the mornings, but they are just so comfortable. Both top and bottom are super comfortable and super warm. I saw a review when deciding to purchase these around a year ago that complained about the material balling up from the fabric w/ wear and wash. I have seen that too and I don't care because they are sooo comfortable and get the job done whether for running or athletics outside (snowboarding) or for just being around the house w/ the heat turned down low. Thanks WEERTI! ... show more
Reviewed in the United States on January 31, 2026 by Jacob Grant Brown
    • Nicely does the job!
Size: 3X-Large Color: Charcoal
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! ... show more
Reviewed in the United States on January 21, 2026 by Capt.Jim
    • Comfortable and keeps you warm
Size: Medium Color: Black
Comfortable and keeps you warm. The material is also of very good quality.
Reviewed in the United States on May 19, 2026 by Vij

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