Nexx Xr3R Helmet Liner Replacement helmet liner for Nexx Xr3R Helmets. Fitment: XXS (20mm) Compatible with helmet sizes: Xxs-Xs XS (16mm) Compatible with helmet sizes: Xxs-Xs SM (18mm) Compatible with helmet sizes: Sm-Md MD (14mm) Compatible with helmet sizes: Sm-Md LG (18mm) Compatible with helmet sizes: Lg-3Xl XL (14mm) Compatible with helmet sizes: Lg-3Xl 2XL (11mm) Compatible with helmet sizes: Lg-3Xl