The Dually Custom S was designed with specific curvature and shaping to fit dreamily in a camper van. Two layers of temperature resilient memory foam in a portable, foldable form to make room for your gear during the day with plenty of room to sprawl when the sun goes down. SIZING GUIDE FOR VANS "It&&';;s hard to overstate how comfortable the Dually is. I&&';;d stay it rivals the Purple mattress I have in my bedroom. But unlike my bedroom mattress, the Dually is 100% at home in the outdoors." - Gear Junkie Review Using the same foam and fabrics as the classic Dually, the Custom S is the "California King" of our product line. Designed and shaped specifically for use in vans, the curved end piece fits perfectly between the back doors. The horizontal bi-fold design creates extra room for stowing gear, and when deployed in sleep mode, an extra couple inches of sprawl space.