From the Manufacturer
The most defining feature of Earth footwear is Kalsø Negative Heel Technology – a unique inclined sole that positions the toes 3.7 degrees higher than the heels. The slight angle shifts weight subtly back over the heels, and can help strengthen and tone the body while also burning calories. To complement this technology, all Earth footwear features reinforced support through the arch, which maximizes the effectiveness of the heel design in promoting a natural walking motion. Signature BioFoam footbeds mold to the shape of the foot, displacing and absorbing shock with each step, and are environmentally-considerate with 70% recycled content.
