Smartwool Classic Thermal Merino Base Layer 1/4 Zip - Women's Size:Medium For a truly customized experience

For a truly customized experience

made from recycled PET bottles [60 g/m2]

Firm arch support for all-day comfort

The Stormtracker Sensor Windbloc® Glove features windproof Windbloc® technolgy and touchscreen-compatible materials for functional dexterity and warmth

- Frigid to Cold

Smartwool Classic Thermal Merino Base Layer 1/4 Zip - Women's Size:Medium For a truly customized experienceSmartwool Classic Thermal Merino Base Layer 1 4 Zip Women's 2026 Ladies Smartwool Base Layer Top We've updated the fit of our Women's Classic Thermal Merino Base Layer 1 4 Zip to improve functionality while also enhancing aesthetics. As one of our heaviest base layer tops and one of our best base layers for cold weather, this garment uses 100% responsibly sourced Merino wool, shoulder panels, and a flatlock seam construction to help prevent chafing as