What's so great about a frameless mask? By eliminating the frame, you create a mask that sits closer to your eyes. This provides a wider field of view to better take in the underwater sights, plus it reduces volume which makes it easier to clear. Also, since there is no frame, the buckles attach directly to the skirt. This enables the mask to fold relatively flat for packing or for slipping into a BC cargo pocket.
SCUBAPRO's FRAMELESS is diving's original frameless mask, and it's still the best. Its distinctive rectangular single lens shape is classic, providing an excellent field of view on the periphery as well as straight ahead because your eyes don't have to contend with a center post.