Designed to keep us cool and comfortable during warm-weather rides, the Castelli Men's Flusso Full-Zip Jersey is an ideal choice for training through the dog days of summer. It sports a semi-fitted design that hugs the body closely, but isn't a skin-tight race fit. Castelli's Prosecco GT fabric is lightweight and actively wicks moisture away from the skin, helping our bodies regulate temperature when we're slogging up a tough climb in triple-digit heat.