This specially developed perforated brown leather is designed to minimize the amount of slide and hold its coefficient of friction longer than the competitions. It is accurately placed between the PS6 and PS2 materials. The bowling approach is recommended for medium to slippery approaches, such as lower humidity or slightly dusty environments. The bowlers style for the modern day power-player who wants a lesser amount of slide. You must trim the Perfect Slide Soles before attaching them to your shoes and you should never wear your shoes with the VELCRO fasteners exposed as this will contaminate them.