High volume heel cup cradles the heel"s fat pad for natural shock absorption, stability and support. * Encapsulating Stabilizer System [ESS] provides optimal underfoot support. * Rebound&tm; High Impact Foam resists moisture and contours comfortably to the shape of the foot. * Full forefoot shock pad adds extra comfort under the metatarsals and toes. * Agion antimicrobial treatment helps inhibit odor-causing bacteria, and the friction control top cover helps reduce blistering. * Note: Mold will only show whole sizes even though a half size may be indicated.