The Fly Racing Knee Guards are HDM (High Density Memory) protectors made of a special blend of viscoelastic foam with memory function, allowing for repeat impacts. The protectors have been impact-tested and approved to CE EN1621-1:2012 to ensure a high level of protection. The pads are both soft and lightweight to ensure they stay comfortable. 4-way stretch mesh panels at the rear help give a great fit and allow hot air to escape, keeping the pad feeling cooler with additional foam protection at the sides and top of the knee to give extra coverage. Strategically placed straps at the upper calf muscle and at the thigh help to prevent the pad from slipping down during use.