![Reinforced version, high rebound coil spring](https://images-na.ssl-images-amazon.com/images/G/01/x-locale/common/grey-pixel.gif)
Reinforced version, high rebound coil spring
The material of each layer is strictly selected, the built-in two layers of 45D high rebound sponge material and high carbon steel coil springs, the high performance 3-layer construction reduces the impact of 42% and relieves the pressure touching the bottom of the foot, allowing it to be used by adults and children.