There are dozens of scuba mask manufactures on the market, ranging from high-end silicone that contours to your face to low-end rubber that may or may not crack after a few uses. Knowing the difference between masks will help you choose one that will not only fit comfortably, but will also last for years and repeated dives.
Size
Masks come with adjustable straps so the actual size of the mask itself shouldn't be an issue. There are other variants in size that separate one mask from another. For instance, the viewable area differs from one mask to another. One mask may have a thick black frame with a round viewable window, while another mask may have a fully transparent frame with a goggle-like viewable window. Most masks also vary in the nose compartment size. The small area just below the viewing window is where your nose rests. This section should fit comfortably over your nose without allowing water to come in.
Features
If you require contact lenses or glasses to see, scuba may be something you wouldn't have normally considered. Technology has advanced to the point where several mask manufacturers can create a custom mask for you that uses your prescription, allowing you to see just as clearly as anyone else underwater. Another new feature is the option for a nose purge. Sometimes water will get in your mask and you're left with few options on clearing the water, especially if you're dozens of feet down. A nose purge allows you to clear the water from your mask by blowing hard through your nose.
Considerations
The most important factor when comparing masks is the fit. If the mask doesn't fit comfortably on your face out of the water, there's no way it's going to fit comfortably underwater. The way to test its fit is to place the mask lightly on your face without using the straps. Breathe in one time through your nose and continue breathing through your mouth as if you were underwater. The mask should automatically form to your face and prevent any air to come in.
Significance
Finding the right mask will have a significant impact on the quality of your dives. A comfortable mask that you forget is on your face can make it seem like you're wearing nothing at all, while an uncomfortable mask that constantly fogs up or leaks can ruin the experience and turn you off from scuba entirely. Don't take the choosing of your mask lightly. Weigh all of the options and features and choose one that you are absolutely positive is the right one for you.
Warning
Most dive shops have a very strict return policy on masks--there are no returns. Once a mask has been submerged into saltwater, that mask is most likely yours for life. You don't want to choose one in haste and find out underwater you should have purchased the model just above the leaky one on your face. Ask if the dive shop has a small freshwater pool for you to test the mask out in.
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