Smartwool Merino 250 Base Layer Bottom – Men's Size:M The relaxed fit and side-slit

The relaxed fit and side-slit hem give you room to move without the boxy feel

A flexible build and grippy TPR outsole mean they can actually move — and stay upright — on slippery surfaces

Removable and breathable PU insole

100% recycled nylon with DWR finish sheds light rain and cuts wind on exposed ridges and open trails

Built for runners who log miles before sunrise or after dark

Smartwool Merino 250 Base Layer Bottom – Men's Size:M The relaxed fit and side-slitBuilt for cold weather output on winter hikes, backcountry hunts, or camp mornings, the Merino 250 Bottom is our top pick for athletes who run hot and cold in the same day. 100% merino wool naturally regulates temperature and fights odor without chemical treatments, while flatlock seams keep things comfortable under a shell for hours on end. 100% merino wool construction delivers natural warmth, breathability, and odor resistance without synthetic