The Smartwool Women's Classic Thermal Merino Base Layer 1/4 Zip is one of the heaviest base layer tops Smartwool makes, now with an improved fit. It's 100% merino wool in their 250 weight, so it stays warm and breathable on the coldest days.
Merino is our go to first layer under ski gear. This heavy weight is the one we hand people who run cold.
Cold resort days, winter hiking and layering under a shell. Made for powder days at Monarch Mountain.
