Clean technology production protected by worldwide patents Our process uses specified core materials which are sandwiched between two layers of recovered natural leather fibres. This is achieved by a process called 'hydroentanglement' which E-Leather has developed and patented for this purpose. The product is 'composition leather' which weighs up to 40% less than traditional leather, this is then finished to add colour, grain and texture plus specific performance requirements such as scuff protection or fire resistance.