The Castelli Core Mesh 3 Sleeveless is designed for use in the warm summer months.
By wicking away sweat it allows the body to maintain a more constant temperature meaning you stay more comfortable and perform better.
The big upgrade on the 3 model is a more open neck for better cooling (It also sits under an aero jersey better) and a whole new stretch Magic Mesh that fits snugly but does not contain Lycra.
