The Diving Mask was created for both free diving and scuba diving. Every part from the frames construction and small skirt to the compact mask, strap and buckles, helps reduce drag and internal volume. The trimmed-down skirt traps a minimal amount of air against the diver’s face. The frames design also allows the lens to press in slightly as depth increases, reducing internal volume even further. Flat glass and the lens sits close to the eyes, expanding the field of view. The streamlined mask straps allow precise adjustments and the compact, rotating buckles are easily disconnected. The Bottom Line: mask keeps volume and drag to a minimum making diving easier for scuba divers as well as free divers.