Comfort against leakage was the first point for me. Other masks I've used create some pressure points to avoid leaks that end up causing headaches. It has a rubber lining that is very comfortable and does not allow leakage. The next point is that I hate getting salt water in my mouth or a build up of salt water interfering with my breathing and making a gurgling sound. The same rubber lining that makes the mask comfortable also creates a reservoir for water to enter through the snorkel. There is also a drain for water from this reservoir. It was the smoothest snorkeling I've ever done because it held the water so well. Finally I saw a review about breathing problems causing headaches - not my experience at all. We swam pretty hard in this mask and even got into some deep waves that broke pretty hard. Not once did I feel like I was having trouble breathing or not getting enough circulating oxygen. It held up very well even when we swam where we probably shouldn't have been.
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