The T.K.O. Sleveless Base Layer is constructed to disappear. The Base Layer is based on the PNS Mechanism Pro Sleveless Base Layer. Made from a unique knitted fabric, the base layer allows heat and moisture to escape from your skin, actively cooling you down when moving. The T.K.O. Sleveless Base Layer is made to work as part of PNS's pro-level system of performance kit, leveraging the output of your efforts on the hardest days on the bike.