Customizable, independent distal aircells: Integrated inflation system allows individualized fit; no hand bulb needed Non-marking, skid resistant rubber tread: Improves traction and durability SoftStrike technology: Absorbs and dissipates the energy during heel strike and reduce heel pain Low profile rocker sole: Enables normal walking gait; reduces forefoot angulations and knee hyperextension Trimmable and heat-moldable semi-rigid shell: Easily custom-fit for comfort Sleek, open-frame design: Provides ventilated protection and supports compliance Contours around the malleoli: Eliminates pressure for sustained comfort Three-strap system: Evenly disperses pressure and eliminates pooling of edema Intuitive, integrated inflation system: Permits quick and easy customization of each aircell Small: For men's shoe size, 4 - 7; women's 5 - 8