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                  How to Measure Your Face for a Prescription Snorkel & Scuba Mask
Buying a mask online can be tricky — so we built multiple ways to check fit and feel confident the seal will be just perfect.
Measure Width
Outer eye corner to outer eye corner in a straight line (don’t wrap).
Measure Height
From just under your nose to just above your eyebrow line.
Optional: Head Size
Wrap a string around your hat line, mark, then measure. Use the table as a guide.
Enter Your Sizes
Use our slider tool to enter your measurements & find your perfect fit.
 
      Quick Face-Size Checker
Tips: use a straight ruler (don’t bend it), check in a mirror, or ask a friend to help.
3 Head-Size Checker (Optional)
 
        Head-Size to Mask-Size
Measure your head the same way you’d measure for a hat. Use a soft tailor’s tape (or wrap a piece of string/cord), around your head above the ears and just above the eyebrows, then read the length (or measure the string). Keep it level all the way around.
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                      About the measurements
                    
                    
                  
                  We measured the relaxed inner seal and the gently stretched outer seal to give a realistic Min/Max window. Your goal is to sit comfortably inside that window, especially on width, so the mask seals without over-tightening the strap.
Remember to keep the measuring device straight without bending around the cxontour of your face.
Lens choice comes after fit
Pick your frame size first. Then choose lens power for your diving mask with prescription lenses using the lens calculator (find below):
                    
                  
      
        
        
          Underwater, light bends differently and can make your usual prescription feel too strong. 
          We lower it slightly to prevent overmagnification and keep your vision clear.
        
      
      Step 1: Enter your prescription to determine your recommended underwater vision
    
Use − for myopia, + for hyperopia.
Suggested Lens Strength:
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What customers think about the store
Store specializes in quality prescription diving masks and water sports gear. Customers consistently praise fast shipping, accurate prescriptions, and excellent customer service. Products enable clear underwater vision for those with vision needs, with reliabl...
