Marcia Kilgore, together with biomechanics experts at London South Bank University, UK, combined biomechanical engineering techniques with ergonomics to develop a triple multi-density midsole and launched the FitFlop in 2007. This kind of sole can relieve the pressure on the feet, reduce the load on the joints, change the characteristics of the foot injury of the flip-flops, and wear it while walking as if it is exercising, so the FitFlop clip slip-on slip-ons are also known as "action shapewear shoes", which have swept Europe, America, Japan and Australia and other places. The upper of the FitFlop slippers is mostly shiny metallic, or decorated with rivets and rhinestones, which is very eye-catching, and the fashion function of the FitFlop slippers has been greatly improved by Hollywood artists, and it is sought after by hipsters around the world. The price of the official website ranges from tens to more than 100 pounds, and the Chinese region is exclusively represented by Belle Group.