The Novastar oro-nasal mask (Dräger Medical, Lubeck, Germany) is a flexible, transparent mask shell with a fine silicone gel cushion which adapts to the wearer's face. The pliable ring embedded inside the flexible clear shell allows the mask to be bent and adjusted to fit the patient's face (customized fit), while minimizing leakages. The mask has magnetic, self aligning clips for capture and secure fastening of the mask headgear. The magnetic clips are self-aligning.