Buy Airflex - Crystal Flat Knee Boots - Knee-High Boots (Black) at THE ICONIC with Free overnight delivery and Free returns! The Airflex Crystal Flat Knee Boots feature elasticated gusset and wedge outsole. For comfortable shoes that don't sacrifice style, Airflex offers a classic collection with shoes for every occasion, featuring quality leathers and cusioned insoles for all day comfort. - Heel height: 2.5cm - Elasticated gusset - Wedge outsole Upper: Leather and Other Inner: Textile Sole: Non leather