Base Layers

Smartwool's warmest base layer, the Merino 250 offers all the benefits of no-stink Merino like natural temperature regulation and moisture management. The boot top length delivers a perfect fit with performance boots.

With the Mid 250 Zip T, you quit only when you want to. With next-to-skin Merino, it wicks and regulates core temp as a solo piece or smartly layers up when it gets chilly. First Layer fit with no-chafe.