AirSelect Standard Standard Walking Boot, X-Small; Mens Shoe Size Up to 4, Womens Shoe Size Up to 5; Height of Brace 13.6″; Mid Footbed Width 3.6″; Toe Footbed Width 3.8″; Calf Width 4.0″. The Standard has a durable, semi-rigid shell that supports the limb while providing protection. Housed within the shell are two adjustable distal aircells that provide compression and support the malleoli. SoftStrike technology absorbs and dissipates shock, while the light weight and lab-tested rocker sole combine to encourage a natural gait and a continuation of everyday activities. Customizable, independent aircells (NO separate hand bulb). Non-marking, skid resistant rubber tread. Removal of heel pain. Low profile rocker sole. UOM: 1/EA.