Urethane is a type of polymer that belongs to the family of elastomers. It is made up of long chains of molecules, which are connected by urethane linkages. These linkages are formed when a hydrogen atom from one molecule is covalently bonded to an oxygen atom from another molecule. Urethanes have many applications due to their unique properties such as high strength, elasticity and resistance to chemicals and abrasion. They can be found in various industries including automotive, aerospace, construction, and footwear.