The shell of the Assault guards is made of Zytel, a tough in durable, yet lightweight engineering polymer by DuPont. Zytel performs extremely well in a very broad range of temperatures. The advanced material allows the Assault to be cost effective without compromising performance. DuPont Zytel: The shells of the protectors are made with the advanced technology polymers DuPont Zytel, a special plastic that is extremely stiff and durable and performs extremely well in a very broad range of temperatures. The assault are cost-effective versions of the original Slytech forearm guards and shin guards that do not compromise performance. ARIAPRENE: A revolutionary alternative to synthetic rubber. It is non-toxic, easily decompostable, readily recyclable and actually outperforms the less eco-friendly alternatives. SlyGrip Foam: SlyGrip foam is made with Ariaprene and offers optimal comfort and superior grip even at extremely low temperatures. Anatomical Shape: The shell's anatomic shape allows for a perfect and comfortable fit of the shin guard and forearm guard with the athletes leg and arm. Ready-On Straps: Ready-On straps provide an effective tighten/release system that allows for fast on-off and race ready fitting. Take care to avoid velcro attachment to race suits, which will pill the fabric.