Race face flank leg d3o guard the race face flank leg d3o guard features the same knee construction as the ambush pad with just enough of an extension to put an end to pedal bite the open back construction means no awkward shoe removal on the trail featuring d30 high performance shock absorbing foam features d30 high performance shock absorbing foam additional foam extension saves shins from pedal bite proven race face open back construction no shoe removal necessary perforated neoprene