【Ergonomic Design】: Engineered to address common airplane seat discomfort, this cushion contours to your body's curves. It prevents fatigue during extended periods of sitting, helping you conquer long flights and leave “flight anxiety” behind. 【Lightweight and Portable】: Fits Any Seat Measuring 16.77 inches × 16.77 inches × 1.38 inches, sondur travel cushion fits standard airplane seats, car seats, and office chairs. It easily slips into your carry-on bag, ready for business trips or getaways, ensuring consistent comfort wherever you go. 【Comfort & Pressure Relief】: Experience space-age comfort with our 3D Air Cell Technology system. Independently tested to provide 72% greater pressure relief than memory foam cushions. Hexagonal air chambers simulate zero-gravity support, offering relief for your tailbone during flights exceeding 12 hours. 【Premium Materials & Sandwich Construction】: Durable and hygienic. Crafted from high-quality TPU material, it offers puncture resistance and easy cleaning. The breathable surface prevents sweating, unlike bulky memory foam cushions. 【Airplane Seat Cushion Customizable Comfort】 After being filled with air, you can press the exhaust valve button to adjust the gas in the seat cushion to a comfortable level. The daily airplane seat cushion can be inflated to 60-70%; the inflation volume is 40-50% during flight to cope with changes in plateau pressure.