This is the replacement cushion seal for the React Health Siesta Nasal mask. It is recommended to replace your cushion seal when it becomes discolored or has excessive leaking. The average life span is 1-3 month. For best results clean daily with a mild dish soap. This sleep apnea interface is one of the most petite and flexible masks on the market. The Siesta Nasal Cushion is simple to install. It simply clicks into place on the Siesta Nasal Mask Frame. No tricky buttons or clips. It is available in Small, Medium, and Large. The Siesta nasal cushion provides a comfortable ad effective seal over the nose.