BS EN ISO 10768:2010

Shoes - An item of footwear made from Leather or other synthetic materials

rubber - Synthetic rubber is any artificial elastomer, usually a polymer, and is used as a substitute for natural rubber.

rubber - Natural rubber is an elastomer derived from the latex containing sap of some plants.

fatigue - A medical aspect of tiredness.

Extension - Something that is made bigger through adding to it, for example a conservatory extension on a house.

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