Upgraded air Leak-proof Valve: Each layer of airbag has an upgraded version of leak-proof valve, which is highly sealed to prevent air leakage. Comfortable to Use: The wear-resistant thermal insulation foam bottom is comfortable for pedaling without bump. High Quality Material: The high-strength hot carbon tough PVC layered independent airbag adopts reinforced thermal fusion technology, which is firm and not easy to break. If a single layer leaks, it will not affect the normal use of the surrounding baby. Product Sizes: 110 * 88 * 33cm; 128 * 85 * 45cm; 155 * 108 * 46cm; 181 * 141 * 46cm. Baby Falling Prevention: The thick bottomed inflatable bladder effectively blocks the cold on the ground, avoiding the rapid drop in water temperature, and prevents the baby from falling and stung while swimming or playing in the pool.