• Taichi designed these for racing and they do the trick !! - RSU266 Pants available too !! • The RS Taichi Cool Ride Sports Under Shirt RSU265 is constructed with a quick-wicking, anti-microbial, and deodorant polyester fabric to keep you cool and comfortable. • Materials: Nylon Polyurethane Key Features: Technofine material used to wick away sweat and create a cooling effect from evaporation. • REALLY!! It cools you off. • Mesh Fabric in high sweat areas of chest and back with high airflow areas for mass breathe-ability. • Moisture Wicking/Quick Dry Material Highly Breathable. • Anti-microbial and deodorant materials used • UV Protection.• Limited to Stock On Hand - Superceded by the NEW RSU320
