Outer material: natural fabric. Lining: canvas. Sole material: rubber. Closure: no closure. Fit: poor. A larger size is recommended. Comfortable shoes made from 100% organic cotton directly from Spain. They are extremely practical to use as they are elastic and do not need to be tied. Structure The sole is made entirely of 100% organic natural rubber bound by vulcanization (without using adhesives), the insole is made of 100% pure organic cotton, the tip is made of reinforced rubber. Cotton materials: direct from Spain with a Made Green certificate, which confirms that it is a production without harmful substances, without the use of child labour, 100% environmentally friendly, as you can read the label on Natural World shoes. RUBBER - Directly derived from the rubber tree is the best quality that allows you to walk comfortably without losing flexibility. These are the features of a first-class shoe; the old, revised and improved production system from Natural World is to weld the two materials, cotton and rubber. Welding is ensured by a special machine, a high temperature mould (170 C) on which the rubber is poured to melt and adhere to the cotton that forms the shoe, with pressure on both materials. Without the use of chemicals or glue, Natural World shoes are produced exclusively by heat and pressure.