Earth Exer-Clog features rubber sole, suede and patent leather upper, elastic insert on top of upper, and adjustable Velcro strap. Exer Clog is available in black. Earth Exer-Clog fitness clogs are comfortable, stylish and will get you fit while you wear them. 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