Eddie Bauer is my go to now. I bought the top and bottom first ascent base layers over 10 years ago and they are still like new. Super warm and flexible enough for mountaineering, climbing, or any extreme winter sport. I use them for work as well. Can't go wrong Eddie Bauer from what I've seen so far.

Comfortable for everyday wear in cold weather.

Bought this set of merino wool base layers for my son. He's an electrician and often works in outdoor areas or unheated new construction houses. He loves this material and said it keeps him quite warm, almost too warm at times depending on how active he gets.

Made very well. Keeps me warm and dry.

great fit, not too tight like some of the other layers, very comfortable

These base layers are rock solid. First ascent is the real deal. I do a lot of backpacking as well as lengthy day hikes and these thermals hold up. Super durable as they've held up to many years of abuse. Can't go wrong with First Ascent base layers.

Great base layer for hunting

Use these all winter long fishing and hunting, warm and comfy.

I love wearing these under my chinos in the winter to keep myself warm. These fit perfect even under my slim fit pants and make cold winter days more manageable. One complaint is that they have pilled but for a base layer that's fine

Absolutely the best fit feel comfort and warmth from the thin layer to these the medium weight. The best, hands down.

good quality, fit, feel

Overall good, but the seams are annoying. The waist is too loose while the seat is too narrow so hourglass figures should take a pass.