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❄️ Stay warm, move free, and own the cold in style!
SIMIYA Men's Long Johns Thermal Set features a soft fleece-lined base layer made from 95% polyester and 5% elastane, delivering warmth, elasticity, and moisture management. Designed for active winter lifestyles, it offers breathable, quick-drying fabric with 4-way stretch and a convenient fly hole, making it perfect for skiing, running, hiking, and everyday cold-weather wear.

| ASIN | B0CDQ3TTKX |
| Age Range Description | Adult |
| Apparel Closure Type | Pull On |
| Apparel Fabric Stretch | Medium Stretch |
| Apparel Fabric Weight Class | Medium Weight |
| Best Sellers Rank | #53,630 in Clothing, Shoes & Jewelry ( See Top 100 in Clothing, Shoes & Jewelry ) #37 in Men's Thermal Underwear Bottoms |
| Brand Name | SIMIYA |
| Care instructions | Machine Wash |
| Closure type | Pull On |
| Collection Name | Winter |
| Color | Black |
| Customer Reviews | 4.5 out of 5 stars 983 Reviews |
| Fabric Stretchability | Stretchable |
| Fabric Type | 95% Polyester, 5% Elastane |
| Fabric type | 95% Polyester, 5% Elastane |
| Fit Type | Athletic |
| Fit to Size Sentiment | Positive |
| Front Pleat Type | Flat Front |
| Garment Size Country | United States |
| Import Designation | Imported |
| Item Length Description | Long Length |
| Item Type Name | Base Layer Set |
| Leg Style | Skinny |
| Material Type | 95% Polyester 5% Elastane |
| Model Name | Wu15-black-l |
| Number of Items | 2 |
| Origin | Imported |
| Pattern | Solid |
| Pattern Style | Solid |
| Product Care Instructions | Machine Wash |
| Rise Style | Mid Rise |
| Sport Type | Multi-Sport |
| Style Name | Men's Thermal Pants |
| Style Number | WU15 |
S**S
Great quality
Works amazing during the winter, true to size, the waistband is great, and it doesn’t smell at all
H**G
Great for the price
I used these while deployed and worked great. I'm 6 foot at190 lbs and these fit perfectly. I was impressed by them considering the price. They have lasted 4 cold months in a deployed environment and are still in great shape. I even wore these under mt running gear and usually run 3-8 miles and these didn't give me any chafing or anything like that. No issues with the material being itchy or having an odor like some cheap clothes can sometimes have.
M**R
Super comfortable and warm
I'm 57 years old and have owned the old school cotton and wool long johns in my life. Thes are the warmest, thinnest, and most comfortable long johns I have ever owned. I bought 2 more pairs from the same manufacture for just the bottoms but, they were different and was to loose. The top was too tight but, is has to do a bit with my gut. I'm going to keep an eye out for a discount on these an order more when the price comes down. Don't get me wrong, the price was reasonable, I'm just cheap and watching my dollars.
R**S
Great Purchase!
I am very pleased. So far these fit and felt excellent. I want to order at least one more pair asap!
J**R
Works
Soft and comfy. Not as warm as we thought.
L**A
nice and warm....
they fit my son perfectly. the fabric is soft and easy for him to move around when hes outdoors walking or shoveling snow. very comfortable. and they really keep him warm. so it is a very good buy !
M**E
Very good thermal set.
This is a good solution to keep you warm under your uniform in cold times. Really useful.
A**R
Simya thermal underwear set
Ordered a 4x they are very small. Top fits like a 2x. Bottoms are fine.
M**T
Thermal underwear
Great items, very warm and does what they supposed to do. Great price as well
A**E
Hervorragende Ware, besser als erwartet!
Sehr erfreulich! Die Ware kam pünktlich und sehr gut verpackt. In praktischer Zip Tasche. Falls man die Ware zurücksenden möchte, einfach perfekt. Ich probierte die Thermo Unterwäsche sofort an. Zunächst einmal war ich sehr erfreut, dass die Wäsche optisch aufgebessert war, mit schönen, hellblauen Streifen und einer weiteren blauen Applikation. Ein Blickfang. Und dann diese Wohltat. So herrlich warm und so gut zu tragen. Ich bin begeistert. Es ist permanent kalt in all meinen Räumen. Die Heizung ist uralt und funktioniert nicht mehr optimal. Ich habe selten mehr als 17,8 Grad, mitunter 18 Grad. Da ist diese Unterwäsche ein Segen. Jetzt komme ich gut zurecht. Deshalb habe ich die Wäsche gekauft. Und genau so funktioniert sie auch. In bester Passform. Hatte 3XL bestellt und befürchtete, dass ich mich reinzwängen müsste. Aber nichts da. Die Wäsche passte ganz hervorragend. Hätte nicht kleiner, aber auch nicht größer sein dürfen. Schmiegt sich wunderbar an den Körper an. Ich bin wirklich sehr froh, sie gekauft zu haben. Zusammen mit sehr dicken Norweger-Socken ist mein Outfit für den Winter komplett. Ich habe mehr bekommen als ich überhaupt zu erwarten geglaubt hatte. Und das für diesen Preis! Erstaunlich. Würde ich immer wieder kaufen. Danke.
M**E
Very Happy with my SMALL size
I got myself a little body tape measure. It loops around, so you can properly measure your chest, head, waist etc.. It's rather useful. Anyway.... since using that and sizing myself up for future purchases, I've been finding all sorts of perfect garments. These fall into that category. I would normally go for a medium in the past - then wonder why things were a bit big. However, at that time, small was too small, so I was kind of stuck. Sizes have changed these days and there's lots more to choose from. I went for small this time round and these are figure hugging tight as a result. However, not the warmest. I've been cold with these as underlayers. So whilst they do provide minimal protection, I would consider thicker materials than these provide if you are braving winters and need warmth. Despite being hugging, they have plenty of give, should I put on an inch or two. Therefore perfect. They feel rather soft on the inside and are perfect for using as a double layer/underneath PJs. Great for underlayers under outdoor clothing as well. But again, not the warmest I've worn. I personally bought them to wear all the time throughout Winter, and have other sets of underlayer garments. Those are more sporty and thicker, whereas these feel a lot more natural as undergarments in my honest opinion. They are good quality. They also look good on me, which is very rare and the colour is nice too.. kind of a medium grey and therefore versatile with other colours. If they are tight, then they accentuate whatever curves you have, plus keep the heat in. DOUBLE BULLSEYE and exactly in my opinion, how these things should fit. Anyway, I am on the lean side.. so hope this review helps in that aspect. If you have a bit of meat, go medium.
C**G
Gut.
Sie hält warm wen es nicht allzu kalt ist, ca bis 3-5 Grad beim Fahrradfahren. Wenn es kälter ist 2 Stück übereinander ziehen 🫣😂
P**L
Perfect for a fisherman
Onistly one of my best buys this year, they are soft and keep you very warm when in the cold. As a fisherman who is sat in the cold temperatures for several hours at a time there's are perfect for it.
Trustpilot
2 weeks ago
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