Replacement silicone rubber cushion for the ResMed Swift FX Nano CPAP Mask. This cushion is available in three sizes - Small (62231), Standard (62230), Wide (62281). All Nano sizes are compatible with any Nano mask model - either the "standard" model or the "for her" model. For example, if you have a "standard" Nano model, you can get the small cushion for it. Of if you have the "for her" Nano model, you can get the standard or wide cushion for it.