Replacement headgear strap for the ResMed Swift FX Nano CPAP Mask. This includes the silicone headgear strap with buckle, along with the gray backstrap. Note that the Swift FX Headgear (61529) and the Swift FX Nano Headgear (62238) are interchangeable. The same is true of the Swift FX for Her headgear straps. Every available Swift FX headgear strap can be used with any available Swift FX mask model.