Meet the better-than-ever Smartwool® Classic Thermal Merino Base Layer Colorblock Crew, where performance meets modern aesthetics. Designed with a slim fit that moves with you, this pull-on crew redefines winter comfort with wool, naturally thermoregulating, odor-resistant, and luxuriously soft against the skin. Its shoulder panels eliminate top shoulder seams for a smoother feel under gear, while flatlock seam construction keeps chafing at bay, even on your longest climbs or coldest trails. Stylish colorblock detailing adds a bold edge to your base layer game, blending function with fashion effortlessly.