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Shop nowWorked well in the mountains of Kyrgyzstan
"Kept me warm and comfortable on the freezing nights of my trip, definitely recommend trying on if you can in store as I thought my size would be different. Good product"
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$145.00
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$145.00
This item's price has been updated recently to ensure you get the best value.
Last priced at -
Our best-selling base layer bottoms made from soft and breathable 100% merino wool jersey, the 200 Oasis Leggings With Fly are the perfect foundation for your cold-weather layering.
Good for:

100% Merino Wool, Exclusive of decoration
Machine wash cold gentle cycle. Wash with like colors. Do not use softeners. Do not bleach. Do not tumble dry. Line dry in shade. Cool iron. Do not iron print. Do not iron decoration. Do not dry clean.
Model measurements
Height: 6'3" / 191cm. Waist: 33.1" / 84cm. He is wearing size Medium.
Key product measurements
Inseam Length: 78.1cm based on size L
Fit
Slim
Overall rating: 4.7438426 / 5 from 203 reviews.
The Men's Merino 200 Oasis Thermal Leggings wFly are highly regarded for their excellent quality, perfect fit, and ideal weight for cold-weather layering. Customers praise the soft, comfortable, and odor-resistant fabric, as well as the durability and high-quality construction of the product.
Review topics: ["size","fit","weight","works","fabric","material","quality","pants","feel","comfort","wear","base layer","layer","weather","moisture","leggings","top","winter","protection","wool","stretch","warmth","heat","johns","buy","john","pair","underwear","clothing","smell"].
"Kept me warm and comfortable on the freezing nights of my trip, definitely recommend trying on if you can in store as I thought my size would be different. Good product"
— Kooper (5/5)
"Great mid layer. I wear them hiking, and around town almost every day in winter under my Levi's. Worth the money."
— Lorie R. (5/5)
"Wore this and the matching top recently when it was 14 degrees out without issue. I had this and my jeans on then the top a short sleeve t-shirt over it and a light jacket while we cleared paths around the property. Kept me nice and warm for the 1. 5 hours we were outside. Breathed well and was comfortable under my jeans and T-shirt."
— Anonymous (5/5)
"The Icebeaker Men's Merino 200 Oasis Leggings with Fly are a fine mid weight legging. I purchased for for Michigan snowmobiling. Like all Icebreaker items they are very good quality. These bottoms are nice and stretchy easy to dry and the elastic seems like very good quality. I do not like the three separate 3 long tags care tags in multiple languages inside rubbing on your left hip. Even after cutting it can still be annoying. I also feel they run slightly on the small side."
— Anonymous (4/5)
"J'adore la texture de la laine Merino"
— Claude B. (5/5)
"Love them! Really confortable!"
— Ariane C. (5/5)
"They fit and feel perfect!"
— Jeffrey M. (5/5)
"Absolutely amazing leggings I wear these 5 months a year"
— Cole (5/5)
"These base layers bottoms are the best. I use them under Goretex shell pants for all my winter sports. They keep their shape and wash well."
— Sam M. (5/5)
"I bought theses as a base layer for skiing and the mountain temps are often in the single digits with wind. They are a touch light when just standing outside or on the chair but perfect while skiing and moving. I think they will also be good for winter hikes or cold spring/fall days working on the water."
— PeterPrinciple (4/5)
Find the size that fits you best based on people just like you.
Use the chart below to determine your size. If you’re between two sizes, order the smaller size for a tighter fit or the larger size for a looser fit. If your measurements for chest and waist correspond to two different sizes, order the size indicated by your chest measurement for tops and your hip measurement for pants.
| XS | S | M | L | XL | 2XL | 3XL | |
|---|---|---|---|---|---|---|---|
| Waist | 27.5-29.5 | 29.5-31.5 | 31.5-34 | 34-37 | 37-40 | 40-43.5 | 43.5-46.5 |
| Hip | 34.5-35.5 | 35.5-36.5 | 36.5-39 | 39-41.5 | 41.5-44 | 44-46.5 | 46.5-49 |
| XS | S | M | L | XL | 2XL | 3XL | |
|---|---|---|---|---|---|---|---|
| Waist | 70-75 | 75-80 | 80-86 | 86-94 | 94-102 | 102-110 | 110-118 |
| Hip | 83-88 | 88-93 | 93-99 | 99-105.5 | 105.5-112 | 112-118.5 | 118.5-125 |
*Looking for the inseam length? Please refer to the product page to find out.
Our three different fits - slim, regular, and relaxed - ensure that when worn together, layers move and breathe like a single garment.
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