The ResMed n30i mask system is an impressive advancement in CPAP mask technology. Its design guarantees a snug fit and reliable seal for successful therapy. The mask's lightweight construction and simple headgear make usage and adjustments effortless. In addition, its QuietAir™ vent boasts even lower noise levels. This is an impressive and comfortable mask system, and I strongly suggest it for those in search of a reliable CPAP mask.