The Fitflop Arena Sandal gives you a workout while you walk. Product Features: Nubuck Sandal Classic H-shape upper High ankle Ergonomic low wedge gives instant extra height Leather lining Leg and mucsle-toning microwobbleboard midsole Tone and tightens leg muscles while walking Helps increase leg and muscle activity up to 30% Absorbs more shock than a normal shoe Helps realign ground force retention to joints feeling less ache in hips and knees Reduces foot pressure Do Not clean in washing machine/dryer or submerge in water.