The Smartwool Men's Alpine Long Sleeve Shirt retains body heat and delivers comfort with ribbed wrist cuffs and a ribbed collar. FeaturesRegular fit is intended to help give you room to move without additional bulkFabric helps combine the moisture management, temperature regulation, and odor resistance of 100% Merino woolMesh zone at center back to help with breathabilityRibbed collarFour-way stretch