This is a replacement V2 full face CPAP mask from DeVilbiss. This CPAP replacement mask has been redesigned to give you more comfort and a better, more stable seal that fits a wider array of facial profiles. One such improvement is the addition of an interior membrane inside the mask’s cushion that greatly strengthens the seal. Also for a better seal, this replacement CPAP mask features a series of flanges around the mask’s base. The V2 replacement CPAP mask is now made of softer, more comfortable silicone for more comfort. It is recommended that you replace your CPAP mask/cushion roughly every 6 months for best performance.