Smartwool SW016355 M's Classic Thermal Merino Base Layer 1/4 Zip COLOR:BKCS 300D recycled polyester with phthalate-free

300D recycled polyester with phthalate-free PVC laminate

Additional body-mapped mesh zones for added breathability

This barely-there design on our best-selling footbed has incredible support and easy ankle-strap adjustability

Our Comfort Shell fabric helps you stay warm and comfortable while on the move in cold weather

Drop-tail hem

Smartwool SW016355 M's Classic Thermal Merino Base Layer 1/4 Zip COLOR:BKCS 300D recycled polyester with phthalate-freeWe've updated the fit of our Men'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 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,