The PneumaticWalker Diabetic System provides pneumatic support with Aircast full-shell protection and is available in 3 sizes (medium, large and X-large). Foam filled aircells cushion the ankle for customized comfort and support while reducing pressure points. This support is effective in managing edema and fracture healing.Key BenefitsMulti-aircell support for graduated, pulsating compression. Custom inflated aircells for individual fit and support. Aircell inflation regulated by hand bulb pressure gauge. Lightweight design: rigid foot, flexible around calf for strength, fit and comfort. Full shell protection. Low profile for natural gait. Sizing Information : small men 4-7, women 5-8. medium men 7-10, women 8-11, large men10-13, women 11-15, x-large men 14-19. women 15 and above.