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🔥 Elevate your base layer game — warmth, stretch, and freshness in one sleek package!
The MAXHEAT Mens Thermal Underwear Long Johns Set by FITEXTREME features a premium fleece lining for superior warmth, quick-dry and moisture-wicking fabric for all-day comfort, and 4-way stretch with flatlock stitching for unrestricted movement and durability. Designed as a compression fit base layer, it’s ideal for outdoor sports, hiking, and winter activities, combining performance with a sleek, slim look.














| ASIN | B017SJK76C |
| Age Range Description | Adult |
| Apparel Closure Type | Elastic |
| Apparel Fabric Stretch | High Stretch |
| Apparel Fabric Weight Class | Lightweight |
| Best Sellers Rank | #510,811 in Clothing, Shoes & Jewelry ( See Top 100 in Clothing, Shoes & Jewelry ) #9 in Men's Thermal Underwear Union Suits |
| Brand Name | FITEXTREME |
| Collection Name | Winter |
| Color | A Sporty Set_black |
| Customer Reviews | 4.4 out of 5 stars 2,311 Reviews |
| Fabric Type | 92% Polyester, 8% Polyurethane |
| Fabric type | 92% Polyester, 8% Polyurethane |
| Fit Type | Stretch |
| Import Designation | Imported |
| Manufacturer Part Number | LYSB017SJK76C-SPRTSEQIP |
| Material Type | 92% Polyester, 8% Polyurethane |
| Neck Style | Crew Neck |
| Occasion Type | Hiking,Sports |
| Origin | Imported |
| Package Quantity | 1 |
| Pattern | Solid |
| Size | Small |
| Sleeve Type | Long Sleeve |
| Style Name | Soft |
| Style Number | LYSB017SJK76C-SPRTSEQIP |
B**G
Comfy and Warm - Fit Well
Got these for an upcoming ski trip and immediately tried them on when they arrived. I am getting another pair now. Im 5"10, 170lbs, so pretty average size. Medium fits me perfectly. They are bit snug (which i want for a base layer) and very comfortable. The neck/collar is a little big, but no different than some of the v-neck style shirts today. The exterior has a spandex/lyra feel while the inside has a microfeecy kind of feel. They feel a bit thicker than a regular base layer and seem to be pretty warm. Will write an update after my ski trip and getting to use them in the wild, but I am pretty impressed thus far! 01-31-20 02-23-20 Returned from my ski trip. These are great! I got a 2nd pair after my previous post. These are warm and comfy and layer well. It was -11 for several days and I was fine with these and thin/waterproof shell pants on my bottom half. For my top half, I layered with a light performance jersey and light wind breaker with an outer shell. I never felt cold. I wore these as my base layer for 2 days of active skiing and they didnt stink after removal. No issues with stitching or quality thus far and i have washed them now a few times. These seem like a great base layer for a wide range of winter temps!
C**N
*BIFL ALERT*
BIFL ALERT(or as close as you can for a garment). I have had a pair of these for years and had to get 3 more pairs. I have taken these through the ringer and back. Camping, trout fishing, snowboarding, work,,,it doesn't matter, they have held up. It's $13 for a set!?! I have purchased name brands and spent stupid money on base layers that can't hold a candle to these. A lot of folks reviewing saying they're too tight.... they're base layers, you want them tight dummy. I'm 5'10" a buck eighty, a large fits me perfect. Highly recommend for a solid base layer.
R**O
Good product but interesting...
First of all the material is fantastic. It wicks moisture as expected and keeps me feeling warm and dry while skiing. I normally buy thermal underwear to fit snug. I believe it works better that way. I purchased top and bottom in the extra large (XL). The top fits just the way I like it. It is long enough to cover my waist and some of my butt. The bottoms are the interesting part. The legs have extra material to cover my ankles but the top including the waist band seems short on material. In other words I have to pull them up into my crotch so the waist band reaches my waist. It's not uncomfortable but they did ride down some during skiing. The material in the waist area does seem equal to that of the legs. Hard to describe and by the way, the labels are in Chinese. I wasn't sure how to wash them but I assumed washing and line drying to be the best practice. I will buy them again but perhaps an XXL in the pants.
J**S
Best Base Layer on the Market (not for Dad bods)
For everyone concerned with the size let me clear it up. I am 5ft 8 185 and the large (m100) for me perfectly! These long underwear are meant and should fit very tightly, like a wet suit. They also create warmth by you moving around. Thats how they are designed. I wear them under a cross country racing suit on extremely cold -10 to -20f and after the first mile I am toasty warm. They may feel cold when you first go outside but that’s ok start moving! They are also NOT designed for a “dad bod” . So if that’s your body type I would suggest a thicker and looser long underwear. If you are a x-ski racer, alpine racer, winter runner, fat biker or winter hiker I would highly recommend these long underwear. I live in MN where winter temps can be brutal and these are my go to base layer every time.
A**R
Super base layer for cold climates
These are my go-to base layer for biking in the winter. I’m in northern Vermont and ride outside (fatbiking) most of the winter (down to -5F/-20C). These have a soft soft-thermal layer inside, but the outside has a finish that feels wind-blocking. Crazy good value. This is truly the unicorn for something really inexpensive but super effective. Get at least a size larger than normal. I’m 6’2” 192 lbs and normally large or XL, but definitely do an XXL in this.
J**S
Order separately to get a better fit
Order the top and bottom separately. I ordered the size large which is what I needed according to the size chart. Both the top and bottom are larges or "105" which is centimeters and is about 41 or 42 inches so the bottoms I got are not 36 as the size chart would suggest but 42 which is way too big. Other than the sizing issue, I like these. They kept me warm on my early morning walk and the inside is softer than the major brands I normally use. I am considering getting more in a smaller size.
N**H
Kept me warm
Let me start by saying I'm a woman. I know they make this product for women but I have long arms and legs so I wanted it to fit those. I'm 6 feet and 160 pounds and ordered a small. It fit great. No problem with it not having a fly as I don't need one. I will say it's baggy in the crotch (I think some guys will be happy to hear) but it wasn't bothersome. I used it while skiing and it kept me warm. It is definitely skin tight (maybe not compression tight though) but I feel like it didn't impede any movement. It feels good against my skin as it has a thin fleece inside. I will definitely recommend and buy again.
E**Y
Kept us Warm and Toasty
These were essential during our trip to Colorado. I'm pretty sure we wore these almost the entire week (even slept in them a couple of nights). The fleece isn't the kind of fleece you might be used to - it's thin, but very warm and very soft against the skin. The outer material did pill a bit, but you wear it under your clothes, so that's to be expected and not a big deal. I read complaints about the arms and legs being too short - well, it's essentially underwear, it's supposed to fit to your skin. I found the length and fit to be perfect. I cannot recommend this enough. Because this helps me when I'm looking: 6'1", 190lbs and a L was perfect
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