This Slim-Line one size fits all headgear perfectly fits the Philips Respironics Pico Nasal CPAP Mask. 4 Point style HeadgearAdjustable with velcroFits the Pico Nasal MaskMade by Philips Respironics Fitting Guide Tip: Adjust the top and bottom straps by pulling the tabs back evenly. The mask should rest lightly on your nose. Do not over-tighten. The headgear should fit loose and comfortable.