[Soft Material] The surface of the stair treads is made of polyester fiber, which is soft and durable, fits very well when stepping on the mat with bare feet, comfortable and skin-friendly; and has sound-absorbing properties, noise reduction and shock absorption, making going down the stairs quiet and soundless, very suitable for Use on wood, marble and stone steps. [No Glue & Anti-Slip] Different from other stair mat backing, this stair mat backing is made of non-slip forest rubber without glue. The rubber is an elastic body, which is dented by external pressure and forms an arc-shaped surface to increase resistance and generate sufficient friction and grip to prevent movement and ensure safety when going up and down stairs.