Designed to keep us at just the right temperature during our ride, the Castelli Collapse Long-Sleeve Jersey is our go-to for mild temperatures. The brushed fleece interior provides optimal warmth and comfort, while the Warmer X-Stretch fabric on the sleeves and sides offers added stretch to give a snug fit and enhance mobility. With gripper elastic at the waist underneath three rear pockets, we can confidently store all the essentials we need for a long ride without worrying about the jersey sagging down.