LAMBERTZ PROTECTOR: even distribution of pressure and padding on the Achilles tendon,ARCH BAND: supports the ankle to promote a secure stance,blend of polyamide, acrylic, polypropylene and elastane,BIOSPLIT footbed: padding and ventilation zones relieve pressure on sole of foot at high stress areas,padded ankle, instep and toe,CROSS ventilation: mesh fabric for good instep ventilation