LAPASA Men's Thermal Underwear Set Soft Fleece Lined Long Johns Light/Mid/Heavy Weight Base Layer Top & Bottom M11/M24/M57
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Extended holiday returns
FREE refund/replacement until Jan 31, 2026 Learn more
FREE refund/replacement until Jan 31, 2026 Learn more
This item's return window has been extended for the holiday season: FREE refund/replacement until Jan 31, 2026
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
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Availability:
Only 1 left in stock, order soon!
Arrives
Dec 9 – Dec 15
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Special Size Type: Thermoflux 300 Heavyweight
Size: Medium
Color: Olive Green
Department : mens
Date First Available : May 17, 2023
Best Sellers Rank: #67,243 in Clothing, Shoes & Jewelry (See Top 100 in Clothing, Shoes & Jewelry) #80 in Men's Thermal Underwear Bottoms
#80 in Men's Thermal Underwear Bottoms:
Customer Reviews: 4.6 4.6 out of 5 stars 13,176 ratings
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Dec 9 – Dec 15
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Special Size Type: Thermoflux 300 Heavyweight
Size: Small
Color: Heather Black
These were my favorite item last Winter. They are very well made, comfortable, and very warm. If you are planning on sub-zero weather this season don't skimp, get the thick 300 option. A+++
Reviewed in the United States on November 1, 2025 by jeff foster
Special Size Type: Thermoflux 300 Heavyweight
Size: Medium
Color: Heather Blue
I am always cold. If the temperature is below 60F, I start having difficulty regulating my body temperature. I have spent more money on various "warmest rating" outerwear and base layers than I care to think about and nothing seemed to cut the cold of midwest winters...until these. I was so impressed with the performance of these that I now own four sets of the thickest/warmest ones as well as two of the mid-weight shirts for when I need a bit of added warmth but not a full set of base layers. I spent 16 hours insulating an attic while it was 19 degrees outside in just these with a sweatshirt and pants over them and I was never cold at ALL. They're also great for doing outdoor winter projects. Sizing/fit: Across the four sets that I now own, there is some slight size variation but not enough that I would order anything but my usual size. The navy blue set runs a tad short/small but it works just fine. I believe these generally fit very true to size. These have a lot of stretch for ease of movement and don't fit as snug as many base layers do. I like that. If you're on the fence about size, unsure whether to buy your usual size or size up, I would suggest your usual size. Bottom line: if you're on the fence and wondering if this will just be another base layer than makes promises it can't keep, these actually do the job and do it well. GET THEM.
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Reviewed in the United States on December 31, 2023 by sbonne
Special Size Type: Thermoflux 300 Heavyweight
Size: Large
Color: Black
Warmth on the coldest days
Reviewed in the United States on November 17, 2025 by Jeff
When I first opened the box I was surprised to see a nicely packaged product that gave it a real premium feel. The underwear is EXTREMELY comfortable and from the moment I put them on I could feel the extra warmth. The day I bought them I went for a walk with my family and it was about 50 degrees out. I didn't feel like wearing a jacket so I just wore the long underwear under a sweatshirt and jogging pants. I felt very comfortable and the underwear didn't make me too warm. The material is extremely light and soft. It felt like I wasn't even wearing it. The only thing that's preventing a 5 star rating is that the bottoms have a little too much give in the waistband. I'm 5'10" and 180lbs and ordered a large. The top fits nice, but I may end up returning them for a M. I also don't know if they will be good for subzero weather. I'll have to wait to winter to find out.
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Reviewed in the United States on October 18, 2018 by J Ram
The product feels premium. The fit is perfect!
Reviewed in the United States on November 13, 2025 by Tanzid
Special Size Type: Thermoflux 300 Heavyweight
Size: X-Large
Color: Dark Heather Grey
I work outside in the winter( Southeastern PA) These do great to keep me warm through the work day.. I will definitely purchase these again
Reviewed in the United States on September 18, 2025 by Jim k.
Special Size Type: Thermoflux 300 Heavyweight
Size: Medium
Color: Olive Green
First, let me say that, while I ordered a medium, a large with shipped to me. Rather than go through the return, refund and reorder process, I decided to try contacting LAPASA first. A representative replied to my message in the same day, offering to send the correct size straight away or refund the product immediately. The representative, who did supply her name, did not request that I leave positive feedback (or any feedback at all) as a stipulation to receive her assistance. She just acknowledged the problem, offered the solutions and did it in a friendly manner. I chose a replacement. Great communication and resolution. As stated, my info is 195lbs / 6'0" / Size: Medium. I originally ordered the large and it was too loose on me/didn't hug my skin. The mediums fit perfect. I have long arms and legs with a short torso. Even so, the length of both the top and the bottom is good. Although I haven't worn these in very cold weather, the thickness and quality of the outer material is very good. Added to that, the fleece inner material is substantial & soft. These thermals should perform very well in cold weather. Indeed, they do seem to be heavyweight as promised. I will update after testing them in said conditions. For my preference, the thermal shirt could be longer in terms of body length. But it does have sufficient length to be tucked in. I believe this product to be a fantastic buy and my update will be posted very soon, as the weather has just turned, heading towards bitter cold. (I've included two images of the inside fleece material in an attempt to illustrate the thickness and quality. Otherwise, the set looks exactly the same as pictured.)
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Reviewed in the United States on November 16, 2022 by Todd E Astarita Todd E Astarita
Living in the south and working indoors, I haven't had a chance to wear these a lot. But when I have, I've been very pleased with the purchase. Unlike old school "waffle" long johns, these have a fleece lining that makes them extremely comfortable against the skin and the heavyweight version lives up to the name, I'd say. I've warn these as a base layer in 25F weather and stayed more or less comfortable. I'd say they run slightly large. If you want a tight fit for your base layer, you *may* want to consider ordering a size down. However, I didn't feel it was necessary as my cold weather outer layers are a little baggier as well.
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Reviewed in the United States on February 21, 2025 by RSG