A boykit or body kit is a collection of exterior modifications to a car, typically comprised of front and rear bumpers (fenders), side skirts, and spoilers. There are many companies that offer alternatives to the original appearance of the vehicle from the factory. Body kits components are designed to compliment each other and work together as a complete design. Despite this, the 'mix and match' approach is often seen on cars, where the front of one body kit will be matched with the rear of another.