Castelli idro jacketthe castelli idro jacket is made from gore tex shakedry technology an innovative fabric construction that eliminates the textile on the outer face of the fabric resulting in a 2 layer fabric thats lighter and doesnt absorb moisture on the outer face this means that the water rolls off and you stay drier and it packs away in sizes that were impossible until now castellis take on this new technology is made for cyclists seeking maximum performance now you dont have t