Opti-Cool Headgear soft protective helmets are molded out of the finest EVA grade ‘A’ rubber foam available. Made from over a 1/2“ thick ultra lightweight waterproof foam, protection is our number one priority. Each helmet has a ventilated protective core that is covered in Lycra or a waterproof moisture wicking felt (Cooling Helmet Option) for extra comfort and durability. Opti-Cool Headgear is used for injury prevention, special needs such as Autism, Epilepsy, and sensory and balance disorders. Other uses include water sports, sports, headaches/migraines, which makes for the most versatile helmets available today. Optional custom wrapped cooling gel packs provide relief for migraines and headaches. Sizes are for children & adults.