I had some Cabelas polarized sunglasses that were getting old and they didn't sell them any more. So, I stumbled on Calcuttas. I got a different model and like them a lot. The sizing is a little tight on the back of my head - I'm hoping they loosen up some to be more comfortable. In terms of sun blocking, they are not super dark, but fine for low light to normal sun light. I like them and would buy them again.