The material consists of very soft foam which, together with a very good suspension, allows an optimal exercise. This small thigh exerciser is very effectiveProtective foam handle, outer up to 30mm, grip comfort, strong sweat absorption, increase friction, increase safety.Thanks to its thick high-density steel, the spring does not deform, so that it supports more weight, is robust and durable, as well as resistant to dirt and falls . The spring does not emit any annoying noise, which makes training very pleasant.Compact design: lightweight and portable, comfortable to use and easy to store. S-shaped design, good elasticity, strong endurance, long-term use of this product to slim legs and reduce thigh fat.You can take this training device almost anywhere and the use, for example during your lunch break at the office. The exercises are well explained and easy to perform. Do some exercise as soon as you wake up. Very convenient. The training manual is very practical and detailed.