This specially developed microfiber material is designed to be the benchmark sole and is in the exact middle of the slide scale bar. It will hold its coefficient of friction longer than the competitions and is accurately placed between the PS4 and PS8 materials.The bowlers style is for all players who want a medium amount of slide on normal approaches.When choosing the proper slide soles the goal is to neutralize or balance the approach conditions with the bowlers style to find your Perfect Slide. A slippery approach will require a lower numbered (PS2, PS4 or PS6) slide sole. And a sticky approach will require a higher numbered (PS6, PS8 or PS10) slide sole. 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.