Project 23 ABS Helmet Replacement Pad Whether you need a replacement liner or are looking for a different size to adjust the fit on your helmet, we got you covered. The Project 23 ABS Helmet Replacement Pad is specific to the Project 23 ABS Helmet and this replacement pad does not include the cheek pads. Each consecutive size varies by 2mm with either an 8mm or 6mm thickness so that you can each size of helmet can be fitted with a larger or smaller liner for the perfect fit. Features Specific to Project 23 ABS Helmet Each size varies by 2mm of thickness so you can tighten or loosen the fit around your head. Sizing Size Extra Small Small Medium Large Extra Large2X Large Thickness8mm6mm8mm6mm8mm6mm Use Replaces Small liner for tighter fit Replaces Extra Small liner for a looser fit Replaces Large liner for a tighter fit Replaces Medium liner for a looser fit Replaces 2X Large liner for a tighter fit Replaces Extra Large liner for a looser fit | 7Idp | Project 23 Helmet Pad Abs | Size Medium In Black