Fisher & Paykel Eson 2 Nasal MaskRollFit Seal The F&P Eson 2 Nasal Mask retains the same RollFit Seal technology as the F&P Eson Nasal Mask. The RollFit Seal rolls back and forth, relieving pressure on the bridge of the nose and allowing adjustment to a wide variety of face types. This seal is designed to deliver a precise fit and effective seal by automatically adjusting on the bridge of the nose. Compared to the F&P Eson Nasal Mask, the F&P Eson 2 Nasal Mask has A larger seal