Imagine a shoe so different it changes how you think about footwear - and exercise. Earth shoes Kals Negative Heel Technology shifts your weight back, helping you burn calories while strengthening and toning your body. It s a part of every Earth shoe design, and part of being good to your whole self. Earth shoes Kals Negative Heel Technology also includes a unique design that positions your toes higher than your heels. A slight incline of 3.7 is complemented by support through the arch, which positions the body to trigger an array of benefits for the whole body. Earth shoes also feature a form-fitting, cushioned footbed with Gelron2000 memory gel to provide a comfortable and healthy experience. For some time, Earth clothing and shoes have incorporated environmentally-friendly practices into the production. Continuously seeking to improve on all they do, Earth was one of the first manufacturers to dedicate 100% of its line to using water-based adhesives. In addition, they have increased its use of recycled cardboard shanks and environmentally-friendly uppers. Earth continually works to pursue more sustainable product development.