Earth Exer-Fit sandals feature rubber sole, man made material upper, and a Velcro strap across the top of thong. Exer-Fit is available in black, bronze, pink, or silver. Earth Exer- Fit sandals are vegan, comfortable, stylish and get you fit while you run around doing your everyday errands. The 3.7° negative heel places your body in a duplication of the yoga mountain pose which is believed to be the perfect body alignment.