For riders looking for maximum protection, the A-Impact PLASMA ELITE Shield Knee Protectors combine the bio-based Nucleon PLASMA technology and a TPU shell to protect against impacts – the perfect protection for the most aggressive trails. The protectors also include extra padding around the knees for additional coverage and have an engineered dual closure system to keep the knee protectors firmly positioned in place when riding. The unique double layer construction is specifically designed to offer improved directional movement of the knees while on the bike. A-Impact Plasma Elite Shield Knee Protector