Tradition in the new and old plastic-plastic, common raw material for resin powder, calcium carbonate mixed sole made in high density, high weight. Abrasion in General. While the old plastic to recycle material, including material can be PVC, leather seats, leather bags and other leather pieces, pieces with black carbon and oil mixed together. Soles of old plastic features into lightweight, low cost (about polyurethane one-tenth). Shoes are often used to export tropical countries.