The 661 rage hard knee guard is a brand new low profile chassis that has a larger knee protection area a padlock connection system attaches to the evo shorts to keep the pads in place and an internal flexible knee impact cap covered in kevlar with hard cap sewn over top to deflect and help slide in a crash this knee guard has a stretch mesh that sandwiches dense perforated impact eva on the inside and outside of the knee a rear of pad is breathable stretch mesh