Perhaps the oldest piece of true diving equipment is the mask. Like other scuba gear, its simple purpose is to allow our bodies to function in a liquid world. The mask's contribution to this adaptation is to provide an air space in front of our eyes so they can focus. Your nose must also be available to equalize the mask's volume and your head's natural air spaces. Simple functions to be sure, but finding the right mask for you can be a complex task centered around one overriding concern: proper fit. Here's a remarkable but true statement: a poorly fitting mask is the most common and significant problem of dive gear selection.
