Dianoo Comfortable Self Inflating Pillow - Travel Summer Camping Hiking Pillow Made of polyester checked fabric coated PVC, wear-resistant, quick-drying, comfortable to feel Widening pressure design can improve inflatable guarantee to prevent leakage due to gravity Self-inflating gas nozzle, just open the gas nozzle and wait for 25 seconds, the pillow will be automatically gas charged Built-in: high resilience sponge pieces. Inflation method: automatic inflatable (unscrew the valve)