They've updated the fit of their Men's Merino 250 Base Layer 1/4 Zip to improve functionality while also enhancing aesthetics. As one of their heaviest base layer tops and best base layers for cold weather, this garment uses 100% responsibly sourced Merino wool, shoulder panels, and a flatlock seam construction to help minimize chafing as well as help keep you comfortable and temperature-regulated as you enjoy high-intensity skiing, hiking, running, and more.

Smartwool Classic Thermal Merino (250) Base Layer 1/4 Zip - Mens

Our Kids' Classic Thermal Merino Base Layer 1/4 Zip uses our super-soft midweight interlocking knit. This versatile 1/4 zip tee is great in cool

Kids' Classic Thermal Merino Base Layer 1/4 Zip

Smartwool Classic Thermal Merino Quarter-Zip Base Layer Top

Smartwool Men's Classic Thermal Merino 250 Base Layer Bottom

Smartwool has updated the fit of their Women's 250 Base Layer 1/4 Zip to improve functionality while also enhancing aesthetics. As one of their

Classic Thermal 250 Merino Base Layer 1/4 Zip Top - Women's

Smartwool Classic Thermal Merino 250 Base Layer Crew - Womens

Smartwool Men's Merino 250 Baselayer Bottom – Climb On Equipment

Women's Classic Thermal Merino Base Layer 1/4 Zip

Smartwool Classic Thermal Merino 250 Base Layer 1/4 Zip Boxed

Smartwool Classic Thermal Merino 250 Base Layer Crew - Mens

Women's Classic Thermal Merino Base Layer 1/2 Zip Hoodie

Smartwool Classic Thermal Merino Base Layer 1/2 Zip Hoodie Boxed

Men's Classic Thermal Merino 250 Base Layer 1/4 Zip