Ripping park laps all day means we're bound to get a little sloppy so it's a good thing we have protection with the Endura MT500 D3O Ghost Knee Protector on. When the trail gets tough we're not thinking about how to best protect our knees while these high-performance sleeves create a barrier between us and the ground. Endura outfits these guards with their special D3O Ghost inserts, which are built to CE EN 1621/1 standards to help protect our joints in the case of a crash.