This is an enhanced version of arguably the world’s best nasal CPAP mask. The Eson 2 seals beautifully without needing to be tight. It has a washable diffuser over the exit valve so it doesn’t blow air all over the person lying next to you. It is whisper quiet and the Eson 2 has a lighter frame than the original Eson. The headgear is slimmer and is also stretchy making it easy to pull on and off like a hat.