No breaking-in required - Myers Flip Sport Mode is ready to move right out of the box. That's the beauty of a cushy foam footbed and under-strap padding.MaterialUpper: PU, Spandex, Polyester Lining: 50% Nylon, 50% Polyurethane Sole: RubberCareNot machine washableStyle number: tuc144885119 Buy HEYDUDE Myers Flip Flop Sport 10 | Sandals and flip flops | Tu