The Pro Slide Glove is now 75% leather increasing strength & durability especially in areas most prone to wear. I.E. The thickness of the center puck has been increased for longevity due to the fact that it takes the brunt of sliding. The most important improvement of all, is the new material used for the pucks. It's a Self Lubricating, Super Tough, High Viscosity Acetal Homopolymer created by Du Pont called Delrin