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🔥 Stay warm, fresh, and unstoppable in the ultimate merino base layer 🧗‍♂️
These 100% superfine 17.5 micron merino wool men's base layer pants offer lightweight to heavyweight options (165-320 g/m²) for year-round thermal regulation. Designed for active professionals, they combine itch-free comfort, natural odor resistance, and moisture-wicking performance. Ethically sourced from RWS-certified Australian merino and OEKO-TEX tested, these thermals are machine washable and built to last—perfect for hiking, skiing, or daily winter wear.




| Asin | B0B8SP5PPG |
| Best Sellers Rank | #4 in Men's Thermal Underwear Bottoms |
| Date First Available | June 22, 2021 |
| Department | mens |
| Item Model Number | 165 |
| Package Dimensions | 10 x 9 x 0.7 inches; 4.8 ounces |
User
Excellent comfort while keeping you warm, designed for men.
Wore these while ocean fishing in Alaska. Fantastic product. Keep me warm through three days of rainy and cold weather without hindering my movement. Most importantly it has a fly which for some reason many competitors products do not. I am 6’2” tall and weigh 208 lbs and extra large fit well.
User
Extremely Comfortable
I absolutely love these. Bought the matching set and both top/bottom are great. I wear the bottoms all the time because they are so cozy. On really cold days I wear them out under my pants, but I wear them consistently under my pajamas at home. Super soft and not itchy at all. I own lots of other merino wool clothing and I feel that these are the best value. It's very soft yet isn't too delicate. Thick so they're warm, but like all 100 percent wool, will wick away sweat and doesn't stink even if not washed regularly. The "Large" size that I purchased is exactly what I expected for large and fits me perfectly. 5'10" 180lbs. and I wear 32"X32" jeans. The elasticity is good enough to comfortably fit at least a 36" waist. I have 2 sets and will definitely purchase the pants again when these wear out.
User
Warm, and Good for Layering, and Great for Cold Rides!
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 yearsCons:❌ Slightly Loose Fit (Medium on 5'10", 180 lbs) – Not overly baggy, just not snug❌ Minor Wear – Small hole near ankle, but nothing majorFinal 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.
User
Happy customer.
I've been wearing this merino wool Base Layer and it's been awesome—especially when that unexpected snowstorm hit. The 100% superfine 17.5-micron merino wool is super soft, never itchy, and doesn’t feel heavy or bulky, even after a full day out. The warmth is impressive, and I love how the wool's moisture-wicking keeps me dry and comfy no matter the conditions. The fit is just right, with no bunching or overheating, which is a big upgrade from regular cotton. The packaging was actually pretty cool, and the included merino hiking socks are a nice extra. My feet was dry by the end of the day. My only hesitation is about the care instructions—it says to hand wash and lay flat, but I’m tempted to try the washer to see how it does. I liked my Smartwool before because you could just toss it in the washer, but that was only 81% wool. Overall, I'm really happy with this one! I bought 2 more.
User
Warm
Bought these as a Christmas gift. Husband loves them, wore them all winter long and the added pair of socks were a great bonus one of his favorite pairs! Super soft, very warm. Only complaint is they get peely after washing but they are an under layer so it doesn’t matter.
User
Best long johns I've ever owned !
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!
User
Comfy Warmth
The only way to know if this garment is comfy, warm, non-itching and fits well is to ... wear it.I did exactly that shortly after I received it. I wore it for 3 straight days. I notice the top is pilling a little bit (what else should you expect from wool), but the top and the bottoms held up to one cycle in gentle wash.The garment instructions that came on a printed card with the piece say something a bit different from the instructions printed on the garment. For example, the card instructions say NOT to place in the dryer, but the instructions on the piece itself say "Turn inside out. Machine wash cold on gentle cycle with like colors. Lay flat to dry recommended or machine dry on low heat. Do not bleach. Do not dry clean, Do not wring dry."So it seems they don't recommend using a dryer, however a fluff cycle in the dryer is the best way we know of to get pet hair off... so that's what we opt for before - or after - laying it out flat to finish dry.I do notice that the tag (which I summarized above - and have included a photo of) is likely to come off... but those tags are often a comfort nuisance. You DO need a magnifying glass to read that tag!I also notice that the pieces we received were made in China (PRC).The fit is good, comfy, and just like the top it's warm, non-itchy with no abrasive seams to irritate my skin. We all have probably had an experience of getting a garment with a tag that is so annoying that you want to rip it off ASAP - either because the tag itself is scratchy or the sewing holding the tag to the garment is obnoxious. This tag is long and thin, but not annoying.How well it will hold up to use remains to be seen... but I don't see anything that makes me think it is likely to fall apart or get threadbare easily. Indeed, the best thing I can say about this garment is that it is MORE comfortable AND warmer than the cotton long johns I have. Cotton is pretty miserable thing to have next to your skin in the cold when you sweat or it gets wet.All the pieces I've purchased so far come with a free pair of Merino socks. The socks are not very thick, but they do seem ok.
User
Base layer for Iceland!
These were for hubby, and he liked them! He liked that they weren't really thick, yet still kept him warm. He wore a matching set as a base layer, then hiking or rain pants on top.
User
Parfait !
Matière très agréable, chaude, confortable. C'est une laine très fine et délicate. Je l'utilise surtout comme pyjama, occasionnellement comme sous-vêtement.Se lave sous programme laine délicat à 30°C et petite dose lessive extra-douce (Mir Laine) (j'utilise un filet). Essorage à petite vitesse (600t/min) pendant une dizaine de minutes. Suspendre pendant 30 à 40 minutes et il est prêt à lemploi. Attention : pas de séchage à chaud !Toujours impeccable après une vingtaine de lavages
User
Su calidad
Muy cálido genial para dĂas muy frĂos en bicicleta
User
Ottimi pantaloni termici oeko-tex
Questi pantaloni termici sono una calda carezza sulla pelle. Morbidissimi. In lana merino al cento per cento, si possono usare tranquillamente tutto il giorno perché attivano un calore naturale, piacevole e duraturo. Sono anche certificati oeko-tex il che significa che sono senza sostanze cancerogene o pericolose. In omaggio c'è un paio di calzini in lana merino di ottima fattura dello stesso colore del pantalone che completano questo eccellente intimo da uomo. Ne ho già comprati due. Consigliatissimo.
User
Warm, weich & geruchsarm – Merino‑Baselayer für lange Abende auf dem Weihnachtsmarkt
Ich habe die Merino‑Baselayer Hose (Herren) über mehrere Abende auf verschiedenen Weihnachtsmärkten getragen – bei Wind, Nieselregen und Temperaturen knapp über 0 °C. Mein Eindruck: angenehm warm, spürbar trocken und kein Kratzen. Genau das, was man sich unter Jeans oder Thermohose wünscht, wenn man stundenlang draußen steht.Praxiseindruck (real getestet)Wärmeleistung: Hält die Beine konstant warm, auch im Stand – perfekt für Glühwein‑Schlangen und bummelnde Runden.Feuchtigkeitsmanagement: Unter der Winterjacke wird’s schnell warm; an den Beinen blieb es trocken. Schweiß wurde gut abtransportiert, ohne feuchtes Kältegefühl.Tragegefühl: Weich, elastisch und kein Jucken. Sitzt körpernah, ohne einzuengen – unter Jeans unauffällig.Geruch: Nach mehreren Stunden draußen neutral geblieben; ideal für mehrtägige Märkte oder Reisen.Pflege: Nach der Wäsche Form stabil, kein Verziehen; Trocknet vergleichsweise schnell.Verarbeitung & PassformElastischer Bund und flache Nähte – bequem, kein Scheuern.Länge fällt leicht sportlich aus (bei mir bis knapp über den Knöchel) und passt gut in Stiefel oder hohe Sneaker.Stoff fühlt sich dichter an als klassische Funktionswäsche, bleibt aber beweglich – gut für längere Wege zwischen Buden.Für wen passt das?Pendler & Marktgänger, die viel stehen und frieren vermeiden wollen.Reisende oder Festival‑Besucher, die geruchsarme und schnell trocknende Unterzieher bevorzugen.Kleiner Hinweis (authentisch)Wenn du zwischen zwei Größen liegst, eher die größere wählen – der sportliche Schnitt sitzt körpernah. Für extrem windige Tage empfehle ich zusätzlich eine Windtight oder eine gefütterte Außenhose.Warum ich die Merino‑Baselayer Hose empfehle:Warm & atmungsaktiv für kalte Outdoor‑EventsWeich & kratzfrei – angenehmes Hautgefühl über StundenGeruchsarm, ideal für mehrtägige NutzungUnter Jeans kaum sichtbar, alltagstauglichPflegeleicht & formstabil nach der WäscheFazit:Für lange Abende auf dem Weihnachtsmarkt und kalte Outdoor‑Tage ist diese Merino‑Baselayer Hose eine sehr überzeugende Wahl. Sie kombiniert Wärme, Komfort und Alltagspraktikabilität – genau das, was man in der Winterzeit braucht.
User
Extraorinario material, los calcetines extraoridinarios,
el pantalon un poco largo, pero de una textura extraordinaria. pide solo large en vez de x-large-
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