The Castelli Men's Climber's 3.0 Jersey is extremely lightweight, features open fabrics for additional airflow and is quick drying all while being aerodynamic. This jersey is soft, stretchy and has a great fit. You'll appreciate how cool you stay on the hottest of days. The fabric on back blocks more than 90 percent of the suns UV Rays so you won't have to worry about burns when your out on those cloud free days. The Castelli men's Climber's 3.0 Jersey is an absolutely amazing jersey you're sure to love.