The Aluminum PLR Race XT is the next generation in aluminum performance foot wear for horses. The XT version of the PLR Race has a 3mm (1/8") wear plate embedded in the toe to both improve the longevity of the shoe and offer a little more traction. Although the wear plate does extend above the surface of the shoe by 3mm, it remains flush with the ground surface of the shoe to minimize its affect on the leverage reduction benefits of the shoe. Optimized Multi-Directional Breakover Relief.