The Castelli Men's Entrata V Jersey is a textured 100% polyester fabric that provides excellent wicking to keep you dry in a wide range of conditions. It has AirMesh fabric around the shoulders and down into the sleeves and side panels to give extra stretch so the jersey doesn't constrict or make you look like you should have bought a size larger. The mesh side panels have a Castelli outline print, while the overall graphic stays clean and sophisticated. The Castelli Men's Entrata V Jersey has a lot of pro racing technology in an all-around performance jersey. It never gets easier, you just go faster.