Black neoprene, same material as wetsuits. This crown is made to get wet! I use mine in the Hilo rain and also out on my s.u.p and my favorite pick for beach days! Also unreal on a blazing hot day to just dip this neoprene in cold water and instantly cool yourself down!. Same fit as our satin lined crowns. Art by the legendary Katch1. Available with fluorescent green or pink.