The bottom is made of neoprene rubber, and the cushion material is made of memory foam EVA urethane with canvas on the heel surface.Neoprene rubber is used for wet suits and has excellent durability.Velcro ankle closure for secure fit.Weight: Approx. 1.8 oz (50 g). Heel cushion thickness: Approx. 0.2 inches (5 mm). *The sole of the heel is made of canvas, so it can be used in games as to basically be used, but please note that the use of supporters may be limited depending on the competition.