Genuine HJC replacement cheek pad set for HJC RPHA-90S Carbon series helmets New cheek pads (and liners) can replace worn old ones and completely change the helmet size in some cases, or customize it for a more comfortable fit All RPHA-90S Carbon cheek pads are interchangeable in all helmet sizes See below for the standard thickness for each helmet size and click on the Size Chart for Liner and other information Small: 30mm /Medium: 30mm /Large: 25mm /X-Large: 25mm /XX-Large: 20mm