Product Overview The Numa Full Face cushion allows you to find the perfect fit while giving you a comfortable feel. It is only compatible with the React Health Numa Full Face CPAP Mask. Available in 3 sizes: Small, Medium, and Large. Features Silky-Soft Silicone Material This replacement cushion provides a superior seal while maintaining maximum comfort and softness. Secure Seal The cushion has a notch located on the top which provides a tight, secure seal to the frame Every Size Fit Mask Frame React Health simplified the features of this mask by allowing all cushion sizes to fit onto the mask frame. This eliminates the need to match up a certain frame size with a specific cushion size. Specifications Brand: React Health Manufacturer: 3B Medical Included In Box: (1) Numa Full Face Cushion (in selected size: Small, Medium or Large) Replacement Cushion Schedule: Every 1-3 Months (or as needed) Important Tips Important tips Only to be used with React Health Numa mask frame. Seal is recommended to be changed once a month.