Hot Chillys Men's Clima-Tek Long Sleeve Base Layer Shirt - The new Clima-Tek fabric features a buttery soft, cottony hand, with all of the performance of a polyester/spandex. Perfect for summer camping in the mountains and winter wear anywhere. Hot Chillys' activated carbon is a proprietary fabric treatment for odor prevention that allows you to wear our base layers for extended periods of time without offensive odor. Four way stretch for unlimited movement Spun polyester has an exceptionally soft hand and feel Relaxed fit for casual or performance wear Activated carbon enhances thermal regulation and odor blocking properties Moisture Transfer Fibers move moisture away from skin to keep you dry UPF 30 protection 86% Polyester/14% Spandex Style: HC5601