S9 Sole is a 9 on a scale from 1-10 (1 would give the minimum slide, 10 would give the maximum slide) Three different zones to allow for a smooth transition through your slide Approach Conditions: Recommended for tacky approaches. Bowler Profile: For the stroker with maximum slide Compatible with Dexter SST 5 or higher shoes. The Dexter SST patented System allows the bowler to change the shoe's sliding sole and heel instantly to adjust to any approach condition: from tacky to slippery, from synthetic to wood. The bowler does not have to adjust footwork or release.