A Leer truck cap, also called a camper shell or topper, encloses the bed of a pickup truck to provide space for cargo or a sheltered place to sleep. John Collins, who founded the company in the late 1960s, first built them out of aluminum.
Fiberglass soon became the material of choice. The ability to mold fiberglass into aerodynamic shapes, along with the lighter weight, allowed Leer to make larger, more elaborate caps without adversely affecting fuel economy.
As of April 2015, Leer creates caps to fit nearly all pickup trucks in production. Options include a variety of windows, roof lines and custom painting to precisely match vehicle's color. Aluminum caps, which stand up better to nicks and dents, are still produced, particularly for the work truck market.