Smartwool have updated the fit of their Men's Classic Thermal Merino 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.

Spring skiing or summer camping?

The Classic All-Season Merino Base Layer Long Sleeve is game for either. With Smartwool's Core Spun technology, they've wrapped lightweight Merino around a nylon core for added durability, while still keeping the comfort of ultra-soft, responsibly-sourced Merino next to skin.

Smartwool added smooth flatlock seams to help minimize chafing and offset shoulder and side seams to lie smoothly beneath pack straps.  No matter the season or the activity, this base layer is made for it.