Ryka Vida RZX shoes put emphasis on flexibility to give you the most anatomical experience possible. Superior cushion and the smooth lining create a luxurious environment for your feet. You’ll love the athletic look and bright color.Upper: Padded tongue and heel collar enhance comfort. Lace-up front offers an adjustable fit. Sleek textile upper provides a smooth fit. Synthetic overlays provide lightweight support. Mesh offers breathable flexibility.Midsole: Smooth lining offers enhanced comfort. Cushioning insole with Anatomical Precise-Return™ footbed provides impact protection and comfort.Outsole: Rubber outsole with strategic flex grooves and ultra-flex forefoot provides enhanced range of motion. RZX: RE-ZORB delivers high-impact heel cushion.