How to Choose
Just like goggles, the most important feature to look for in a snorkel mask is comfort. A soft, silicone gasket and strap define the comfort level of a snorkel mask. Often, snorkel sets are the better choice since they're designed to function as a pair.
Dive Masks vs. Snorkel Masks
Though they may appear similar, masks for snorkeling and diving do differ. Dive masks are typically made from higher-quality materials to ensure a diver's safety and ability to read gauges and visualize their environment. A snorkel mask, on the other hand, can be much more simplistic and, thus, cheaper. For diving, look for tempered glass and silicone gaskets - better materials to stand up to the pressure of deep water.
Caring For Your Snorkel Mask
Eventually, you may find yourself with a broken strap or foggy vision. Straps are easily replaceable with a universal-fit strap or a tailored solution, like the Water Gear Snorkel Mask Strap. To keep fog at bay, apply new anti-fog coating to inner lenses after every few uses.