This mask is frameless and made of a single, tempered lens. We found that it fits the greatest variety of facial shapes and is extremely comfortable to wear even after extended use. The tilting buckles make it super easy to adjust the strap and to fit it properly. The volume of this mask is in the lower spectrum (135 cm3), which makes it easy to equalize but still offers a fantasticly wide field of view.
The Cressi F1 mask is an all time favourite amongst snorkellers, freedivers and scuba divers alike.