Outfit your semi truck to be Ready for the Road Ahead with an ultra-cozy sleeping area, with the InnerSpace 38" x 80" x 5-1/2" Relax Truck Mattress. With a durable and stain-resistant polyester blend, this replacement mattress is the ideal option for operators that require an in-cabin sleeping option. Built with a compression-rolled form to offer easy maneuvering and installation. FleetPride is your First Click in Heavy Duty .