This QuickFit Headgear comes standard on all AirFit N30 CPAP & BiLevel masks. Warp-knitted nylon QuickFit Headgear is unobtrusive and elasticated so it gently stabilizes the mask and pulls the cushion cradle into place. QuickFit Headgear's split-strap design is auto-adjusting and simple to fit -- just spread the back straps apart for a looser fit, or bring them together for a tighter fit. A tiny headgear clip can be used to make minor adjustments if needed, so keeping it comfortable is simple, too.