The Next Level in Athletic Performance. This lightweight mesh sleeveless over-jersey is meant to be worn over the Zero Compression Jersey (sold separately). Its part of a two-piece jersey unit to give you unmatched performance while racing the best in the world. Tailored athletic fit to reduce bunching and excess bulk. Ultra-lightweight polyester stretch mesh material construction used for resistance-free mobility and comfort. The breathable mesh fabric allows for maximum air flow to regulate body temperature. Non-fade sublimated graphics.