Replacement headgear for ResMed AirFit F30. The soft, flexible, one-size-fits-all headgear is easy to quickly slip on and adjust for the perfect fit. Its magnetic clips allow you to snap your mask in place or remove it, for ease of use. It can be attached to small, medium, and large system masks. A recent study proved that the AirFit F30 provides an accurate first-time fit for 93% of sleep apnea patients.