About Product:At first, the straps of the first generation will be distorted by the weight, becoming thinner and thinner, finally forming a rope, then had to add a shoulder pad to cushion the pressure, but soaked in sweat breeding bacteria, heat, etc. will cause extreme discomfort to the shoulders! Then to this one-generation, the use of car seat belt production, to solve the previous one-generation deformation, more and more fine, heat dissipation and other problems, high-strength never deformation, normal use of 10 years no problem!