Where do I find the size?
If you’re looking for the size of the F10 cushion, turn the mask so that the elbow is facing the user. Look to the lower right side of the full face cushion to locate a large embossed letter within a circle. The letter will indicate the size of the full face cushion.
The mask frame size is stamped on the silicone portion of the lower headgear hook. To locate this stamp, hold the mask as though the user is going to put on the mask, with the cushion opening facing the user. The stamp is on the top of the lower headgear hook on the right-hand side of the mask. XS/S = Extra Small / Small; M/L = Medium / Large.