Replacement Headgear Strap for AirFit N30i and P30i Note: The AirFit N30 and N30i are different masks. This headgear is NOT compatible with the AirFit N30. Product Description The ResMed AirFit 30i headgear is designed to give you that extra softness and stability that is so important for a good fit. The headgear strap is available in one standard size and is gray/blue in color. Another key benefit to this headgear is compatible with both the AirFit N30i and the P30i CPAP masks. Included With This Purchase (1) AirFit 30i Series Headgear Strap Recommended Replacement Schedule Cushion: Every 1-3 Months (or as needed) Headgear: Every 3-6 Months (or as needed) Complete Mask: Every 9-12 Months (or as needed) Tube Hose: Every 1-3 Months (or as needed)