Earth Iris Sandal Womens Leather buckle closure Leather upper Adjustable back strap KALSO Negative Heel Technology positions the toes 3.7 higher than the heels, shifting weight back over the heels to help strengthen and tone the body while also burning calories Anatomical arch support promotes a natural walking motion BioFoam cushioning molds to the shape of the foot, displacing and absorbing shock with each step