661 rage hard kneeshin guards671 has an army of athletes worldwide wearing testing and aiding them in their quest to design ultimate protective eqipment be it dirt or street 661 protection has you covered featuresultimate protection with internal hardcap abrasion resistant with stretch kevlarside impact protection with eva foam paddingventilation through perforated neoprenemesh constructionsuperior fit with pre curved chassisstays in place with velcro closures50 neoprene 15 kevlar 15