Smartwool Men's Classic Thermal Merino Base Layer 1/4 Zip Size:Large while UPF 30 sun protection

while UPF 30 sun protection helps shield against harsh alpine exposure

With a 3D Advanced Chassis™ for superior stability and an All-Terrain Contagrip® MA outsole for maximum traction

Premium Merino Wool Blend: Delivers optimal warmth

walking miles on pavement

providing durable protection in temperatures as low as -20°C

Smartwool Men's Classic Thermal Merino Base Layer 1/4 Zip Size:Large while UPF 30 sun protectionMidweight Merino thermal base layer with a 1 4 zip for adjustable warmth, breathability, and cold weather versatility. The Smartwool Mens Classic Thermal Merino Base Layer Crew is a proven cold weather essential built for dependable warmth and next to skin comfort. Made with 100% Merino wool, this midweight thermal layer naturally regulates temperature, wicks moisture, and resists odor, making it ideal for extended wear in cold environments. Designed