Ocean Master Z-4 Equalizer Mask. The Oceanmaster Z4 incorporates 2 front lenses and 2 side widows to enhance peripheral views. You get all the benefit from a traditional style mask with additional peripheral vision. Very easy to clear, Plus You'll be happy knowing that you're buying a mask from the manufacturer that legitimized the purge mask for divers. Ocean Master purge masks incorporate soft nose pockets for allowing quick, one-handed access during a dive. Purge your mask by exhaling through the nose pocket. Ocean Master also innovated the way divers adjust the mask to their head. The Q-Strap is a one-step, mask-on adjustment buckle located on the back of your head for easy reach. Every part of the mask is made extra-durable.

View the pictures below to see close-ups of these unique Ocean Master Mask details.