This specially developed microfiber material is designed to match up with todays modern synthetic approaches and is the most widely used slide sole number. It will hold its coefficient of friction longer than the competitions and is accurately placed between the PS6 and PS10 materials.the bowling approach recommended is for all medium or slightly sticky approach conditions. Best on synthetic approaches with medium to high humidity environments. Bowlers Style is for all players who want a greater amount of slide on normal to slightly sticky 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. 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.