Merino Wool Base Layer Mens Bottom Pants 100% Merino Wool Heavyweight, Midweight, Lite Thermal Underwear Long Johns and Socks
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Availability:
Only 5 left in stock, order soon!
Arrives
Sunday, Mar 8
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Size: X-Large
Color: . 320 Charcoal Grey
Package Dimensions : 10 x 9 x 0.7 inches; 4.8 ounces
Department : mens
Date First Available : June 22, 2021
Best Sellers Rank: #5,084 in Clothing, Shoes & Jewelry (See Top 100 in Clothing, Shoes & Jewelry) #12 in Men's Thermal Underwear Bottoms
#12 in Men's Thermal Underwear Bottoms:
Customer Reviews: 4.6 4.6 out of 5 stars 2,909 ratings
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Sunday, Mar 8
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
Size: Medium
Color: .Black 250
I picked up the medium black 250 and it’s been perfect for cold weather riding and chilly workdays. I’m 5'10" and 180 lbs, and while the fit is a bit loose, the length is perfect. After 2 years of regular use, it’s still going strong—just a minor hole at the ankle, easily hidden by socks. Pros: ✅ Great Cold-Weather Warmth (250 Weight) – Warm enough that I haven’t needed to upgrade to 320 ✅ Ideal for Motorcycle Rides & Cold Work Days – Keeps me warm without bulk ✅ Socks Are High Quality – Cozy and well-made ✅ Durable Over Time – Still in good shape after 2 years Cons: ❌ Slightly Loose Fit (Medium on 5'10", 180 lbs) – Not overly baggy, just not snug ❌ Minor Wear – Small hole near ankle, but nothing major Final Thoughts: Whether you’re riding in the cold or braving freezing temps at work, this base layer does the job exceptionally well. Warm, breathable, and built to last—an excellent investment for cold-weather comfort.
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Reviewed in the United States on April 30, 2025 by Cyborgladiator
Size: Medium
Color: . 320 Black
The Merino Wool Base Layer Mens Bottom Pants are very warm, soft and comfy. I bought the Heavyweight, 320g bottoms, and I was worried about them being too thick, they're not that thick at all, they are perfect, very, very comfortable and warm. I was golfing with them in 40 degree weather with 12 mph wind and my legs were not cold at all, plus they were not too warm either, actually just right. I didn't where anything but a t-shirt, polo shirt, and light wind proof Foot Joy golf jacket on top, but my chest and arms were not as comfy warm, as my legs were, even though I was wearing thin golf pants over the Merino bottoms. I live in a cold, northern, climate and have bought many, many, different types of "long Johns" and these are by far the best I've ever bought. When it comes to bottom layer long johns, I think they should be snug, but not too tight, I have a 33 inch waist and a 32 inch inseam and their medium size fit me perfect!
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Reviewed in the United States on October 14, 2025 by Rich B.
Size: Small
Color: 320 Navy
It's really nice being so toasty warm and feeling so cozy like I'm in my pajamas when I'm out in my work clothes. Super soft 100% merino wool thermals feels so good and soft against your skin. Very functional and I really appreciate that they're not too loose to be baggy and not too tight so the fabric doesn't pull on my leg hairs and is not itchy at all. I didn't know how warm they would be and considered the 250 gm. but I'm really glad I got the 320s because they're not too warm for up north where I am. I do have several shirts of different weights so I can layer to whatever warmth I need and stay warm with just a heavy sweatshirt over them in the northern winter. That's a lot of great value for such reasonably priced, sturdy and durable feeling, odor free, 100% merino wool! I highly recommend merino.tec 320,100% merino wool thermal base layer. You won't be disappointed!
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Reviewed in the United States on November 27, 2024 by Richard S
Size: 3X-Large
Color: 165 Black
Still the best wool, under-clothes layer I've purchased. Very comfortable, great fit and I will buy again. I do wish it had a wider waist band. That's the only thing letting this product down.
Reviewed in the United States on December 31, 2024 by Scott D. Thoms
I wear these 8 months out of the year in Montana. Perfect warmth outside, without being too hot inside. I get everything Merinotec now. Best prices for great wool products. Love the varied wool weight (thickness) selections. Good products though made in China.
Reviewed in the United States on September 9, 2025 by Todd W
Size: Large
Color: Windsor Blue 250
After buying a set of these for myself, I bought them for my husband as well. They’re warm but lightweight and fit well under snow pants for skiing or snow sports. The quality is good and the elastic holds well for several days of skiing. They wash well - I’ve used the washer on delicate and hang dried to avoid any shrinking or pilling.
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Reviewed in the United States on August 21, 2025 by Emma
Size: Large
Color: 165 Burgundy
These are fantastic! Light, warm and don't weigh much at all. Feel great against the skin.
Reviewed in the United States on October 17, 2025 by Beach Brother
Size: Large
Color: . 320 Black
Very warm and comfortable. Exceeds expectations. Fits true to size.
Reviewed in the United States on October 29, 2025 by stacy shaw