Amazon.com: Ovation Medical Gen 2 Pneumatic Walking Boot 。FEATHERLIGHT DESIGN: The Ovation Medical Walking Boot prioritizes user comfort and mobility. It weighs half a pound less than its closest competitor and has the lowest profile on the market, eliminating the need for shoe levelers or additional inserts. • MAINTAIN YOUR NATURAL GAIT: Unlike foot braces and walkers with rigid soles that force an unnatural gait, the Gen 2\'s intuitive sole is contoured in multiple directions and lets patients move naturally, providing wearers a more comfortable experience with greater ease of movement. • INNOVATIVE PNEUMATIC PUMP: Traditional orthopedic boots and air casts have easily breakable, outdated twist valve designs or pumps attached to the top strap that can lead them to inflate on their own, causing discomfort. The Gen 2\'s integrated single push-button release system is simple, durable, and dependable. • SECURE AND CUSTOM FIT: Boasting an innovative shock absorption system, a sure-grip, non-slip resting surface, and flared struts that accommodate all calf circumferences, The Gen 2 premium walking boot offers increased safety, stability and personalized adjustment that ensures the perfect fit for your unique needs. • UNISEX SIZING: Designed for both men and women, with unisex sizes that align as follows: Men\'s X-Small (2-4), Small (4.5-7), Medium (7.5-10.5), Large (10.5-12.5), X-Large (12.5-14.5); Women\'s X-Small (4-6), Small (6.5-8.5), Medium (9.-12), Large (12.5-14.5), X-Large (15-17). Clean pet/smoke free home