Opti-Cool Headgear© soft protective helmets are molded out of the finest EVA rubber foam available. Made from over 1/2 inch thick ultra lightweight foam, protection is our first priority. Each helmet has a ventilated protective core that is covered in Lycra for extra comfort and durability. Opti-Cool Headgear© is used for injury prevention, special needs, sports, headaches/migraines, and multiple other uses, which makes for the most versatile helmets available today. If you select the cooling element, the protective core of the helmet is covered in a soft and stretchable, moisture wicking felt material, that allows for custom cold packs to be placed anywhere inside.