shear resistant cozy cloth inner cover. Heel floats over an air cavity for zero pressure, & air circulation. Water-based gel insert lowers pressure beneath ankle. Anti-foot-drop construction controls dorsal flexion. Foam cushioned sides. Launderable once gel insert is removed Straps adjust for multiple locations.    #503034-S 3" Wide #503035-M 4" Wide  #503036-Lg/Bari 5" Wide Latex Free UNSPSC#42141805