Eson™ 2 seals beautifully without needing to be tight. It has a washable diffuser over exit valve so air doesn't blow all over your bed partner. It is whisper quiet and has a lighter frame than the original Eson™. Headgear is slimmer and stretchy making it easy to pull on and off like a hat. The cushion chassis is smaller and the colour-coded straps make it easier to put together.