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WEERTI

Thermal Underwear for Men Long Johns Set Fleece Lined Winter Cold Weather

  • Based on 14,162 reviews
Condition: New
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Availability: In Stock.
Fulfilled by Amazon
Arrives Sunday, Oct 4
Order within 2 hours and 35 minutes
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Size: Medium


Color: Navy


Description

Stay cozy all season with our men’s thermal underwear set, the perfect base layer for cold weather. At WEERTI, we believe warmth is more than a feeling – it's a way to show care. As a brand dedicated to comfort, quality, and style, we craft thermal wear that keeps you cozy through every moment of your day. Driven by a passion for promoting a healthy and free lifestyle, WEERTI is committed to helping you feel confident, cozy, and at your best every moment, every day of the year.

Department ‏ : ‎ mens


Date First Available ‏ : ‎ May 13, 2020


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


Best Sellers Rank: #3,303 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: 4.6 4.6 out of 5 stars (14,162)


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


Brand Name: WEERTI


Number of Items: 2


Age Range Description: Adult


Unit Count: 2 Count


Import Designation: Imported


Material Type: Polyester


Fabric Type: 92% polyester/ 8% spandex


Apparel Fabric Weight Class: Lightweight


Apparel Fabric Stretch: High Stretch


Product Care Instructions: Machine Wash


Color: Navy


Pattern: Solid


Collection Name: Winter


Style Name: Classic Long Johns


Size: Medium


Garment Size Country: United States


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sunday, Oct 4

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

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View our full returns policy here.

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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 for cold weather
Size: Large Color: Black
I bought this as a gift for my brother for his trip to Brazil. He really liked it! It was comfortable, warm, and fit well. He was very happy with it.
Reviewed in the United States on August 8, 2026 by Daniela burgos
    • 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 ScoBraTec
    • A fantastic pair of thermals
Size: Medium Color: Black
It’s been nearly a year since buying 3 pairs and I can confidently say that they have not ripped or torn during my training, work and adventures! I recommend these without hesitation! I purchased a pair of these so that I could layer up while I work outside in the winter months. I purchased the first pair around nov-dec of 2024. The first pair I bought in medium when I was around 210-220lbs. First impression were that it fit like a glove and felt unbelievably soft. The black color really doesn’t degrade or fade in wash and stains don’t tend to stick around, so washing is easy. I use these to work out too so I can move around with no issues in these and they don’t get too hot either while doing so. Now as for keeping me warm while outside at work, I really can’t say anything bad about these. In 10 degree (F) weather it kept me nice and toasty all shift long. They are quite durable too, as I do Muay Thai in these as well and they haven’t ripped or torn yet from the drills, although my first pair has stretched a bit and fits a bit loose. I have lost a good amount of weight so that’s not a big issue. The other two pairs that I bought after my weight loss fit nicely, but I might have to downsize to a small lol. In short, I really like these thermals. I wear them basically all the time in the winter for all sorts of occasions, even when it’s not cold. I’m mostly likely going to purchase a few more sets of these. ... show more
Reviewed in the United States on March 12, 2025 by Dean
    • 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
    • comfy and warm for the cold days and nights
Size: Large Color: Black
Does keep you warm when necessary Loved it so much bought additional pairs
Reviewed in the United States on July 27, 2026 by Peter Camperos
    • Thermal
Size: 4X-Large Color: Black
These are prefect. I work in a freezer all day long Ave temp is -10 I only wear these and jeans and a hoodie I stay warm all day long
Reviewed in the United States on August 4, 2026 by Kevin McDonnell

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