Xprotex Youth Batter's Black Elbow Guard Memory Foam utilizes body heat to conform and mold to the arm offering a custom fit every time. Latest technologies of A.I.C and Memory Foam delivers comfortable, streamlined protection. A.I.C. (Advanced Impact Composite) an impact-absorbing material conceived through 30 months of development and testing. Cordura shell offers extra durability. In plain language this means the impact load generated by a 100 MPH ball is reduced to that equivalent of being struck with a 40 MPH, thus, drastically reducing the chance of a career changing injury. Light weight slip-on design. No straps; no Velcro, no clasps, no excess bulkiness.