The 2011 Audi Q5 Hybrid Quattro has an extremely light body structure with the rear hatch and engine hood made of aluminum. The rigid body shell incorporates hot-shaped steel in numerous places, combining low weight with extremely high strength. Despite an extensive array of standard equipment, the Q5 Hybrid Quattro with its curb weight of less than 2000 kg (4,409 lb) is the lightest hybrid SUV on the world market.