Last updated on August 1st, 2023 at 11:16 am The Fisher & Paykel’s Eson Nasal Mask features just three parts for simplicity and ease of use. The RollFit seal allows you greater freedom of movement without losing your mask seal. When you change position, the cushion adapts its shape to avoid breaking the seal, reducing the risk of leaks and dryness. The Eson is designed with a quiet diffuser, giving you and your bed partner a peaceful night of sleep. Sizing: Please use the Sizing Guide in our Downloads section below to find the right size.