Description: 【Universal Fit for Children's Bicycles】This seat cushion is designed to fit 12-22 inch children's bicycles, making it highly versatile. Fit for standard children's bike seat posts with a diameter of 22mm and a circumference of approximately 7cm, allowing for easy replacement and installation 【Memory Foam】The cushion features thick memory foam padding that provides great shock absorption during rides. The memory foam offers a soft, enveloping feel that effectively reduces vibrations, ensuring a more comfortable cycling experience for children 【Breathable Hollow Design】The center of the seat cushion incorporates a hollow breathable groove structure to enhance air flow and reduce heat buildup. This design minimizes localized pressure and significantly improves comfort during long rides 【Non Slip PU Leather Surface】Covered with non slip PU leather, the surface is wear resistant. It increases friction to prevent slipping during rides, ensuring safety by keeping the child securely seated 【Ergonomic Streamlined Shape】The ergonomic design features a narrow front to prevent leg chafing and a wider rear for even pressure distribution, aligning with the sitting posture for enhanced support and comfort. Additionally, the reinforced carbon steel rails provide strong support without deformation Size Chart:23.5cmx14cm/9.25inchx5.51inch Package Includes: 1 Kids Bike Saddle Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.