BLACKBIRD SEAT FOAM SUZUKI RMZ450 08-17 STANDARDBlackbird Racing Seat Foams are made of rigid polyurethane foam, they are waterproof and fit perfectly with the original seat base and seat cover. The polyurethane foam is produced using a chemical formula created for the aerospace industry so is of the highest quality. Thanks to the molecules with closed cells it also weighs less than the original seat foam. Standard height seat foam. Firmer material then original seat foams.