The AirFit™ F10 is ideal for mouth-breathers, those who suffer from nasal obstructions or frequent congestion due to allergies or cold symptoms, or those who haven't found success with a nasal mask. Some claustrophobic patients also seem to favor the full face mask. The full-face mask is also suitable for high CPAP pressure settings because the mask's wide surface area makes it feel as if the pressure is more tolerable and less direct than with other masks. Works well for back sleepers, as the supine position is best for an optimal air seal.