Smartwool Classic Thermal Merino Base Layer Crew – Women's

Smartwool Classic Thermal Merino Base Layer Crew – Women'sBuilt for cold weather layering in plus sizes, this crew is our top pick for women who need a reliable thermal base that actually fits and moves. 100% Merino wool regulates temperature and manages moisture naturally, so you stay dry and warm without synthetic fabrics. Flatlock seams and a plus specific cut mean no bunching or chafing under a shell or mid layer. 100% Merino wool construction delivers natural warmth, breathability, and odor resistance

Clean enough to wear into town

60g PrimaLoft Gold synthetic insulation retains warmth even when wet — critical for unpredictable Southern weather

no fuss when you're done for the day

Packs into its own chest pocket — compress it down and clip it to your pack or toss it in a bag

streamlined design

When you want something comfortable and casual without overthinking it

so fit and support are dialed in right out of the box

Men's running-specific fit

Lightweight construction makes it easy to wear on its own or over your favorite athletic gear

UPF 40+ sun protection built into the fabric — critical on exposed ridges and open terrain

Natural odor resistance means you can wear these hard across multi-day trips without issue

while the relaxed fit layers cleanly over a base layer or under a shell