The MaxJax creeper is constructed with a rugged 3/4-inch welded tubular-steel frame and supports up to 600 lbs. This heavy-duty structure gives the seat the strength needed for demanding workshop use while maintaining the mobility expected from a creeper. Heavy-duty marine-grade vinyl provides a durable seating surface that is water, stain, and abrasion resistant, as well as fire-retardant and antimicrobial. The seat is also resistant to abrasion, chemicals, and oil, making it easier to clean and better prepared for regular automotive work.