About the Product •You can buy (Small 16604, Small Shallow 16671, Medium 16605, Medium Shallow 16672, Large 16606, Large Shallow 16673) •This is strictly a replacement item/part. This item does not require a prescription to purchase. •This item is not the complete mask, it is a replacement part for the mask. •This replacement Cushion will only work with matching size frame. It replaces and Cushion for any Ultra Mirage FFM (Full Face Mask). •This product covers your nose and mouth.R & M