Smartwool Men's Classic All-Season Merino Base Layer 1/4 Zip Size:XL offering superior insulation at a

offering superior insulation at a low weight

Full-Length Vibram® dual-density rubber soles have tech inserts

legendary Echo fabric

A round neck and raglan sleeves make layering a cinch

Lightweight socks balance breathability with responsive temperature regulation to keep riders comfortably in their boots all day

Smartwool Men's Classic All-Season Merino Base Layer 1/4 Zip Size:XL offering superior insulation at aOur popular Classic All Season Merino Base Layer 1 4 Zip is the perfect base layer for warm or cold weather. This top uses our All Season weight Merino fabric wrapped around a nylon core to increase durability, while still keeping the 100% soft, Merino wool you love next to skin. Side seams help minimize chafing while wearing a pack and offer a body enhancing fit. This base layer is comfortable, powerful, sustainable, and, frankly, do it all able.