Sunba Youth Self Inflating Sleeping, Waterproof Fabric Camping Pad, Inflatable with Pillow, Outdoor Air Mattress Comfortable and multifunctional Self-inflating: After you unscrewing the valve Extensible: With quick-snap buttons, you can buckle 2 or more Sunba youth camping pads together Waterproof: Sunba youth inflatable mattress is made of waterproof and abrasion-resistant PVC fabric, which can protect you even you lie on damp grass Built-in pillow design