The HardCap features AeroLite® providing superior airflow. Extremely lightweight design, made from lightweight EPP (Expanded Polypropylene) impact liner combined with a tough HDPE shell and weighing less than 135g. Clean Odourless - Both the sweatband and comfort liner have been coated with Polygiene® with an UK Class 1 medical certificate, an anti-bacterial treatment that acts as an internal deodorant counteracting the development of unpleasant odours. Quick drying properties. Reflective detailing for increased visibility in low light environments. Water repellent outer material.