In r ev1 jersey the fit is functional for aerodynamics and high level performance construction giro sleeves and lower collar on the front for a better comfort the back in rib 130 fabric protects from the harmful uva and uvb rays promotes freshness and keeps the ideal body temperature details pocket system ale full zipper ergonomic collar shaped sleeve and waist bands with gripper inside back security reflex for improved visibility flat seams in contrast colors temperature range 18 30