Not sure, when I first tried them on at home they felt awfully close to my eyes. I think my eye lashes were touching the inside lense. Thought they were going to be too uncomfortable for mr. I tried changing the nose bridge to smaller to cinch them up on my nose more to bring them further out away from my eyes, but then they hurt my nose, so I went back to the original size. But when I wore them in the pool, even though they still felt a little close, they were surprisingly comfortable . Used them twice so far, again tomorrow. So the only change I would make is for either the plastic eye cups be a little deeper or the soft foam gasket a little thicker, or a little of both. A couple millimeters would probably suffice. Otherwise, wow. Really hardly need to put any tension on the straps