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 After folding, it has a compact size and can be stuffed into the side pockets or pocket of a backpack The surfaces is make of breathable fabric that conforms to the neck curves Not only suitable for camping and hiking, but also for high-speed trains, airplanes, and napping times The inner liner has good sealing and is not prone to air leakage after inflation It remain full even after overnight use