Both reinforced and non-reinforced hose types are available in a wide range of materials including EPDM, silicon and Vamac. Reinforced hoses comprise of three layers: inner rubber lining, reinforced yarn for extra strength and an external cover for overall protection. They are designed to provide resistance to pressure, ozone, weathering, heat and cracking. Non-reinforced hoses are mainly designed for bypasses with low pressure and where burst and strength are not crucial.