This is a replacement CPAP cushion for the OptiLife nasal CPAP mask. Choose between either a traditional nasal pillow cushion or Respironics’s own CradleCushion. The CradleCushion differs from the traditional nasal pillows in that it has a deeper arc that cradles the nose for improved comfort and seal. Also, the CradleCushion features grooves to help minimize side-to-side movement so the seal stays in place. For optimal performance, replace the cushion roughly every 6 months.