Double Air Couch Folding Sofa Bed Inflatable MattressPool Float Waterproof Blow Up Sofa For Camping Pool Bedroom Overnight – Grey. Multiple modes: It has multiple modes. It is not only a two-seater sofa but also a double bed with a backrest. When you remove the backrest, it will become a comfortable mattress. Durable material: The high-strength PVC material is used, which is not only waterproof but also able to keep the air well, even if it is used for a long time, it will not leak.