Purchased for my Original Series Rex Specs. They do get scratched up kind of fast but to be fair my dog @Charlajeanruss and I do a lot of off-road adventuring. We do sand, gravel, beach, creeks, windy mountainsides at high elevation, winter blizzardy adventures too. Sometimes we just play hide and seek in the cat tails and weeds. The V2 series might be an improved version but for now these are okay. My Charla is a Belgian Malinois and we purchased an Xtra Large but probably should have gotten the size Large. The adjustable straps mean it's still working out okay. So fo rnow the replacement lenses are fine . I will do an instagram on replacing and cleaning them later Worth it.