The Fitflop Sling Leather Sandal give you a workout while you walk. Product Features: Sandals Leather upper Three piece twist design Ergonomically designed open fit 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