Composition Upper: 69% Synthetic Polyurethane-31% Textile Mesh Polyester Insole: 100% Rubber Sole type: RUBBER Lining: 65% Textile Woven Polyester-35% Textile Mesh Polyester Insole: 100% Textile Felt Polyester Heel height: H.25 MM Article class: Amphibiox. The patented Geox systems guarantee breathability of the outsole, ensuring the foot enjoys a sensation of wellbeing.