This top-of-head, 360 degree swivel connection mask, fits under your nose with a cushion that seals around the nares. It is made of a soft rubber that handles high pressures but is easy on the skin. There are 3 frame sizes - small, medium, and large - and 4 cushion sizes. The fit pack includes a medium size frame which fits 85% of people and all cushion sizes. The small and large frame sizes can be purchased on Amazon.