Castelli Espresso Arm Warmers Simple but effective, the Castelli Espresso Arm Warmers will extend the lower temperature range of your favourite short-sleeved cycling jersey. Made from Espresso thermal fabric they are impressively warm and cosy, ideal to pull on when conditions are cool and changeable. And should conditions warm up, they're easy to roll up and stash in a jersey pocket. Their single-piece construction means fewer seams for greater comfort while a silicone top gripper keeps them perfectly in place.