Promate Pro Viewer Purge Mask (Rx-Able)/MK280 and Promate Cobra 100 Percent Dry Whistle Snorkel/SK680:
Ideal for medium faces- face seal size W4 3/4 * H3 3/8.
Patented purge design.
Patented channeled skirt design directs bubbles away from view.
Crystal, liquid silicone injected skirt and strap.
Double edge comfort seal.
Swivel and adjustable buckles.
Broad peripheral view.
Optical lenses available from -1.0 to -10.0 by increments of 0.5 (for near sighted).
Optical lenses available from +1.0 to +4.0 by increments of 0.5 (for far sighted).
Made in Thailand.
*Snorkel: A unique, 100% absolute dry design -- Patented upper valve keeps water from entering the snorkel. Allows air to easily enter snorkel for clean and unobstructed breathing. Specially designed cover guards against water splashing into the snorkel. When the dry snorkel is submerged in water, the patented hinged seal reacts to seal the snorkel, preventing water from entering. As you surface, the hinged seal swings open allowing air to enter.
Built-in whistle housing.
Quick slip-in snorkel keeper.
Pre-curved flexible silicone corrugated low section.
Easy purge valve keeps stocking water out -- When feel water stocking in the bottom of the snorkel, simply squeeze the easy purge valve and spit out, which drains water from the bottom of purge that keeps the airway clear.
How to measure your face to see it this mask fits you.
If you look in the description there is a face seal size. You would need to measure the width and height of your face with a ruler. Width is from outer corner of the eye to the other corner and the height is
from the eyebrow to under the nose.