The Zest and Zest Q cushion comes with a foam cushion insert designed to add comfort and to enhance the seal. The cushion is made form medical grade latex and is specific to each mask, The sizing for a cushion is difficult to determine however if you look under the elbow on the frame it will say the sizing.

The cushions for the zest range are compatible on both the Zest Nasal Mask and Zest Q Nasal Mask

Nasal CPAP and BiPAP mask cushions should be replaced every 1-3 months