The castelli lycra arm warmer is a must for all riders looking to complete their endurance racing kit with a simple and incredibly comfortable design it is suitable for use across a wide range of weather conditions an anatomic cut produces a close and flap free fit that at the same time doesn39t constrict while a silicone gripper elastic ensures that the castelli lycra warmer stays held in place at all times the light weight polyamide and elastolefin construction of the arm warm