Long underwear — a.k.a. long johns, thermals, base layers ... the Smartwool layers above are woven with nylon for a bit of stretch, these tops and bottoms are made from pure wool, which means ...

Lined with tiny silver dots that look like foil everywhere but under the armpits, this base layer is designed to keep ...

Modern base layers ... midweight bottoms feature a yoga-style wide waistband with a small stash pocket and a compression-style silhouette. They are made with a blend of merino wool, nylon, and ...