The replacement AirFit N30i Cushion is made of silicone and free of rubber latex or other allergens and is only compatible with the AirFit N30i Nasal CPAP Mask. The complete ResMed AirFit N30i mask system is in the freedom category, a nasal mask providing under-the-nose coverage with a silicone cushion. The complete ResMed AirFit N30i mask system is in the freedom category, a nasal mask providing under-the-nose coverage with a silicone cushion. The quick-release elbow allows you to get up and disconnect without removing the mask. This item is the ResMed AirFit N30i cushion only.