Featuring an innovative design that integrates two separate materials, the Saw tooth Slide Sole creates three unique zones - including the center "saw tooth" zone which includes a blend of two materials for a smoother transition during your slide. The S5 is designed for an average resistance slide, offering slightly more resistance than the S6 but slightly less resistance than the S4. One size fits all Unique hexagon shape Symmetrical design can be inverted based on bowler preference