The sandal upper is crafted with 100% recycled polyester, excluding trims. The recycled polyester in this product was created by reprocessing existing materials. Padded recycled polyester satin upper. Natural rubber insock. TPR outsole. Heel height: 4.5cm/1.8in. Adjustable velcro strap. Calvin Klein tonal logo on the strap. Runs true to size. Country of origin: Vietnam. Colour: blue