Upper: 100% calfskin leather Inner lining: 75% pig skin and 25% calfskin leather Sole: synthetic Cushioned insole Buckle closure Heel height 5 cm (2") Excellent condition. Never been worn. First photo is stock. responsible leather manufacturing through the Leather Working Group. From manufacturer: Sustainability: ISO 14006 Ecodesign: We design our collection by identifying environmental impact throughout the product life cycle, with the aim of minimising it. ISO 14001 Environmental management systems: We protect the environment and minimise pollution in all our processes. Through Amfori certified BSCI audits, we monitor the social and environmental sustainability of the entire supply chain. Zero Waste: We place value on raw materials, reducing waste and promoting their re-use. Questions? Leave a comment below!