There’s a lot of things to consider when sailing. You can’t be master and commander if you can’t see so you want something that will beat that harsh glare reflecting off the water’s surface. Something with a good polarised lens perhaps. There’s the spray and the salt from the sea so you might want something to help with these or you could be forever cleaning your lenses too. Go for a pair that you’ll never want to take off. We’ve got loads that are so comfortable you’ll forget you’re wearing sunglasses.