It’s an undergarment, but fits loose. Warm for the weight classification. Would buy again.

I wear this at work mostly in the spring and fall and it holds up great. I usually wear a medium but the small fits great in this instance. It keeps you warm even when wet and is great for an underlayer while hiking.

Very Warm

I wore these in Zion when it was a low of 21°F. These were overkill by far. They are incredibly warm, almost too warm.

Basic But High Quality Product.

The leggings are the perfect base layer for all your cold weather activities. I’ve used them snowboarding, climbing, backpacking, and jogging. 150 is just the right amount of warmth that doesn’t cause you to overheat while exerting yourself. My only suggestion would be to incorporate tall/ short sizing rather than just XS to XL. As so someone with a very skinny waist I had to go with the small size, which rides up significantly as I’m 6,2ft. Not a big deal as I always wear these with long socks.

Another Stellar Item

These are very very well anatomically mapped leggings that fit very comfortably. Once again OR has outdone itself in the realm of outdoor clothing, this time in merino baselayers that I would argue are better quality than some of the brands that are known for making nothing but.

I Would Buy This Product Again

Fits perfectly, very comfortable, use for hicking and skiing.

Comfortable And Warm

This was comfortable and warm under a wind protected covering at -10 for snowboarding. Was able to use for multiple times on same trip with no issues.

Excellent

Excellent comfort and performance. I deliberately wore the whole set in warmer and colder environments than it's made for, no issues. Be mindful when it's new the Red color way puts off a lot of red fuzz.

not a bad product, def kept me warm, but mobility wasn't the best.

Lightweight, Warm, And Comfortable

Merino wool is the way to go! This is a great base layer for cold weather. The sizing is true-to-size, the fabric is a lightweight insulating layer, and the benefits of merino wool mean that there is not bad odor. I highly recommend!

I Would Buy This Product Again

I wear pants like this often for hiking, doing yoga, etc. I especially like these merino bottoms.

Very Comfortable For Bigger Man

I am 6'3", 235, and these are very comfortable. They feel almost athletic like. Sometimes I'll even wear them to bed normally.

Warm, Comfortable, And Well Made!

I am a blind individual, and it is therefore always difficult to purchase the correct items online without getting to physically handle them first. However, Outdoor Research gear has always been reliable and trusted by me. The description of the alpine merino liners on the wetsite was great, and the measuring chart also was exact. Therefore I could purchase the correct size, and had a good idea of the product I was purchasing. I live in the Boston area and have used my liner to go hiking during very windy and cold days. In particular, I was blown away with how the liners performed during a wet and windy hike. I wore my liner and rain pants, and even though the wind made it feel like temperature was in the single digits during my hike my legs were perfectly warm. The liner has also served me well during more practical day-to-day situations like waiting for an Uber in downtown Boston during a windy day at rush hour. Also, the liner is extremely comfortable and I have found that it feels good whether I am wearing it under my jeans or at home by itself. Construction is durable and seems like it will last for a long time; many years of hiking and day-to-day use. Definitely a recommended item from a brand that never disappoints!

Not Recommended

Fabric repeatedly sheds large amounts of dye. Fabric sheds large amounts of coloured dye on skin when worn, and sheds large amounts of coloured dye in the washing machine when laundered. Store did exchange the original item, but the same problem occurred with the replacement item. Unwearable and unusable as a result. Not recommended.

Kept me warm snowboarding as well as in negative temperatures in Alaska.