Nexx X.wst3 Liner Replacement liner for the Nexx X.wst3 helmets. Liners are interchangeable within their shell sizes: 2Xs-Sm, Md-Lg and Xl-3Xl. Sizing: 2Xs-Sm: Available in 18mm, 16mm and 14mm thickness Compatible with 2Xs, XS and SM Md-Lg: Available in 18mm and 14mm thickness Compatible with MD and LG Xl-3Xl: Available in 16mm 14mm and 12mm thickness Compatible with XL, 2XL and 3XL OEM Sizing: 2Xs: 18Mm XS: 16Mm SM: 14Mm MD: 18Mm LG: 14Mm XL: 16Mm 2Xl: 14Mm 3Xl: 12Mm Note: Does not include cheek pads.