The Vitera replacement cushion features the Rollfit XT which adapts to your movement during the night keeping the cushion in place while reducing pressure on the bridge of your nose. This unique Cushion shape is designed to fit a wide range of face shapes while minimizing mask leaks. Blue color coding on the cushion and mask frame provided easy identification where to place the cushion which simply clicks into place. The cushion is made of two parts but does not come apart. It had the soft Rollfit XT that sits on your face and the sturdy harder shell that attaches to the frame.