The Heat-Out Cool'R Long Sleeve Shirt is designed to keep you cool and comfortable when temperatures spike. The Cool'R collection from Heat-Out has raised the bar on performance base layers by creating pieces with multiple advances in heat management.; The Cool'R base layers are designed to move moisture away from your body, extracting it into the air around you as it evaporates. This perspiration wicking technology, in tandem with anti-bacterial fabric, will keep you comfortable on your longest rides. Engineered to be incredibly lightweight, the Cool'R base layers offer multi-directional stretch for a second-skin fit and feel.; Hi-Tech Fabric blend wicks perspiration Anti-bacterial technology reduces odor Multi-directional stretch