FLY Racing’s HDM (High Density Memory) protectors are made of a special blend 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 even on long days pedaling in the saddle 4 way stretch mesh panels at the rear help in giving a great fit and allowing hot air to escape keeping the pad feeling cooler Added foam protection at the sides and top of the knee 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