This is one of the most common questions that we are asked. Every PBO lens is optimized to excel in a specific environment. This certainly does not mean you cannot use your sunglasses in different environments. What it means is that a Freshwater lens will show all of the same detail when you are chasing bonefish on the flats of Walker's Cay. Here is another way to answer this question. Would you use the same rod fishing for marlin as you would for rainbow trout?
That is the quick answer, but the question deserves a bit more respect. We manipulate a lot of variables to bring PBO to life. For example, our impact resistant Hunting and Shooting collection is not a polarized lens. We do this because a polarizing filter can cause slight variations in depth of field and thus affect your shot. If you are offshore, you will need certain qualities in a lens, one being polarization. Bottom line don't wear you Hunting and Shooting sunglasses offshore.