This intuitive headgear is designed for use with the F&P Eson 2 Mask. The headgear is available in two sizes -- Small and MediumLarge. F&P Eson 2 Headgear is simple to use and soft to the touch. Once it has been adjusted it can be applied and removed by simply stretching it over the head. There's never a need to unclip or readjust the headgear straps.