Smartwool Midweight Merino Wool Base Layer

The Smartwool midweight merino wool base layer is built with 250-weight interlock-knit merino wool for reliable warmth, breathability, and natural odor resistance. It regulates temperature well in cold conditions while still breathing during active use.

Comfort-focused details like raglan sleeves, flatlock seams, and a back-to-front wrapping body seam improve mobility and reduce chafing, making this Smartwool base layer ideal for long days outdoors and extended trips.

Midweight Merino Wool Base Layer Review

After using this midweight merino wool base layer review for years, it’s one of the layers I trust most in cold weather. I wear it on winter hikes when I need consistent warmth, and I also use it while backpacking and camping, especially at night when sleeping in a tent.

It’s comfortable enough to wear as pajamas or layered under them, and it keeps me warm and cozy all day and night. The fabric feels soft against the skin, never itchy, and it holds up well after repeated use. It’s a piece I keep reaching for because it simply works.

Who It’s Perfect For

This midweight merino wool base layer is ideal for cold-weather hikers, backpackers, and campers who want one layer that works on the trail and in camp. It’s also a great option for anyone building a reliable layering system for winter adventures or overnight trips where warmth and comfort matter.