Outdoor Research Kids' Sentinel Hat 100% Supplex Nylon Imported Supplex nylon fabric; UPF 31 Insect Shield repels mosquitoes, ticks, ants, flies, chiggers and no-see-ums for ultimate insect protection Odorless, safe, EPA-registered Insect Shield lasts the lifetime of the product (over 70 washes) SolarShield construction TransAction headband