Smartwool Active Ultralite Long Sleeve – Men's gender-men O FIT insole is molded

O FIT insole is molded to each specific pair for a precise

the Micro D 1/4 Zip is the lightweight layer we reach for first

and red across XS–XL sizing

Packs into its integrated stuff sack — keeps your pack organized on long approaches or summit days

Zero-drop platform puts heel and forefoot at the same height

Smartwool Active Ultralite Long Sleeve – Men's gender-men O FIT insole is moldedBuilt for high output days when you need coverage without the weight, the Active Ultralite is our pick for trail runners and hikers who want merino versatility year round. The ultralight merino blend wicks moisture and kills odor naturally, so you can push hard in Southern heat without that synthetic stench. Flatlock seams keep chafe out of the equation on long efforts. Ultralight merino wool blend delivers breathable, next to skin comfort without the