The Moab Knee Protector combines Alpinestars' exclusive, MotoGP derived Thermoplastic hard protectors with dual-density Biofoam to provide a lightweight safety shell for the lower leg. The advanced design also ensures comfort and free movement of the leg while riding.
I bought these after my 661 rampages let me down. these are lopro, comfy, adjustable, but most of all they stay in place. As you can see there is no protection of the back of the leg, and the side of the knee is no padded for top tube strikes. Overall I wouldn't buy anything else, these are the best