Keeping you Ready for the Road Ahead , the Designs International 4” x 38” x 80” Covered Foam Mattress allows you to gain a restful sleep in your truck sleeper bed. This mattress conforms to your individual body type, being made of polyurethane foam. This mattress is compatible with most semi truck makes and models while being engineered to the highest quality standards. Get the best night’s sleep you require to keep you focused and alert while driving with the Designs International foam mattress. FleetPride is your First Click in Heavy Duty .