The Hot Chillys Men's Clima-Tek Zip-T Base Layer Top delivers soft, breathable comfort with technical performance for active days in changing conditions. Its polyester-spandex construction provides four-way stretch that moves with the body while offering durable stretch and recovery. Moisture Transfer Fibers use hydrophobic yarns to move moisture away from the skin, helping keep the wearer dry and comfortable across a wide range of temperatures. Activated carbon incorporated into the yarns enhances thermal regulation and odor-blocking properties. The quarter-zip neckline provides adjustable ventilation, while raglan sleeves allow a full range of motion. With UPF 30 protection, flatlock seams, and a relaxed athletic fit, this midweight layer works well under a shell or on its own. | Hot Chillys Men's Clima Tek Zip T Base Layer Top