Rotate the air gate to automatically suck in air and expand it into shape; After pressing the exhaust button, it can be folded to the size of a palm, making it easy to use The inner liner has good sealing and is not prone to air leakage after inflation. It remain full even after overnight use The surfaces is make of breathable fabric that conforms to the neck curves After folding, it has a compact size and can be stuffed into the side pockets or pocket of a backpack Not only suitable for camping and hiking, but also for high-speed trains, airplanes, and napping times