The F&P Zest Q premium enhances the original Zest nasal mask design, introducing subtle comfort refinements while preserving the great features that made the original Zest so popular. The most noticeable change you'll find with the Zest Q is how quiet it is. Zest Q's updated Air Diffuser ensures minimal noise and efficient exhaust dispersal. An optional elbow cover with diffuser is included for even quieter operation.