ALPINESTARS REFLEX KNEE GUARDS (BLACK) Alpinestars is easily one of the most trusted names in the motorcycle industry because of their passion for excellence, and the Reflex knee guards show every bit of their commitment with their protection, fit and comfort. Alpinestars designed the Reflex knee guards to offer increased protection along the inner knee. Impact resistant polypropylene panels give the Alpinestars Reflex knee guards unmatched impact protection. An asymmetrical design provides the Alpinestars Reflex knee guards a secure and comfortable fit on the right or left knee. Alpinestars designed the Reflex knee guards with a comfortable biofoam backing to allow for cooling to keep you comfortable while riding.