Air Kicks Anti-Gravity Boots deliver a soft cushiony motion that is gentle on muscles, joints and body. They also provide a sensational calorie-burning, coordination-building and leg-strengthening workout. The new and improved wider boot design is ergonomically shaped so just three sizes will fit almost any foot. These anti-gravity jumping boots will fit effortlessly over different sizes of athletic shoes so you don't have to take your shoes off to use them. Your feet will stay cool and dry as you use them. They are made with patented JUMPING JAX technology that captures and transforms downward energy into longer, low-impact strides that are gentle on the knees, ankles and back.