The sandal upper is crafted with 100% recycled polyester, excluding trims. The recycled polyester in this product was created by reprocessing existing materials. Recycled polyester webbing upper. EVA insock. Recycled polyester, PU and bio-based twill lining. TPR outsole. Heel height: 6cm/2.4in. Calvin Klein logo on the strap and midsole. Runs true to size. Country of origin: Vietnam. Colour: black