[More Flexible Springs & Height Adjustable Strap] doorway jumpers feature high-quality 304 stainless steel springs, strong & flexible. Our springs offer an extended and dynamic stretching range. Your can jump higher and have more fun! The nylon rope is equipped with an extensive adjustable height range, granting you the freedom to set the jumper at the perfect height. will enjoy a comfortable and enjoyable playtime. [Better Material, Soft & Comfortable]Safety is very important when play, that's why we strive to make our products safer! Two buckles and adjustable seat belts ensure your safety. Made of soft cotton, it's comfortable for your elder kids to play while liberating parents' hands. The rotating design at both ends of the support bar makes it easy to assemble and fix safely. It is lightweight,convenient to store and carry.