The Fisher & Paykel Eson Nasal CPAP Mask is a nasal mask that covers the nose only. Its lightweight design and flexible cushion create a comfortable mask for all users. It features a RollFit Seal, made to comfortably roll around the nose eliminating pressure.The special diffuser reduces noise levels so you and your bed partner can sleep more peacefully. The diffuser is also completely washable. Another easy to use feature of the Eson 2 Nasal Mask! There are three sizes: Small, Medium and Large.