It can be used directly without the need to fill it with water. Ice - feeling particles are added, which can quickly dissipate heat in the hot summer. It will have a better effect if put into the refrigerator for a few minutes before use. It is sturdy and pressure - resistant. There is no need to worry about breakage, and it can bear a weight of 200 kg. It has a waterproof fabric, making it easy to clean. It is not only suitable for drivers, students, wheelchair users, and office workers who sit for long periods, but also for outdoor activities such as camping, fishing, and balcony seating. Color：Sky Blue Material: PVC+Gel Package Size: 39.5cm x 32 cm Weight: 1kg Note: If the gel accumulates after long - term use, slowly push the gel back to its original state manually. This product includes only the Cooling Seat Cushion, no other items. Due to different lighting and screen settings, the color of the item may vary slightly from the picture. Due to manual measurements, please allow for slight size differences. Whats in the box: 1 x Cooling Seat Cushion