Birkenstock has been in business since 1774, so they must be doing something right. * Arches and deep heel cup provide a flexible support. * Helps with excessive pronation. * Helps relieve heel pain symptoms. * Metatarsal arch a bit higher than regular Birkenstock to relieve more pressure on the ball of the foot. * Semi-flexible to absorb shock. * Durable, breathable Helps relieve heel pain symptoms. Metatarsal arch a bit higher than regular Birkenstock to relieve more pressure on the ball of the foot. Semi-flexible to absorb shock. Arch Supports Birko Sport by A 2-piece replacement insole for all athletic footwear. Flexible cork arch support with an EVA foam liner on top helps to absorb shock and cushion high impact areas. * Material: Foam/Cork * Brand: Birkenstock * Sizes: 35-47