Tossing and turning in bed often pulls on the tube and dislodges the mask from the nose. The Rio II's swivel allows the tube to follow your movements instead of pulling on your nostrils, so contact remains stable even when you change positions multiple times during the night.

• The split back strap distributes tension instead of concentrating it on a single band behind the head
• Velcro fasteners adjust one side then the other to find the right tension, without having to readjust everything
• The lightweight and flexible frame is forgotten once in place and the mask remains silent