A body kit is an assortment of car modifications comprising front and rear bumpers, fenders, side skirts, spoilers. Many manufacturers produce these car parts and accessories so that customers can customize the look of their vehicles. These body kits provide enhanced aerodynamics and also add a touch of aesthetic value to the vehicle. These kits are usually designed to be used as one set, however, many customers mix and match parts from different kits. Body kits are generally designed for various types of automobiles and are made of either fiberglass or polyurethane. The use of polyurethane body kits is preferred by most people as they are highly durable and resistant to damage; they also remain intact even in cold weather. Kits are also manufactured from carbon fiber, which is durable and lightweight. The cost of these body kits is very high, hence, they aren't a very popular option. The boom in the body kit industry during the nineties has forced many automobile companies to build their own custom body kits. Many companies such as General Motors and Irmscher have divisions that specialize in manufacturing body kits. The are a number of aftermarket body kit manufactures such as Irmscher, Lester, MS Design, Reiger, RGM, Steinmetz, Bomex, Onderground-design, Accolade, and Veilside.