I purchased the Kaenon Hard Core and Rhino Sunglasses after doing much research. I was concerned with purchasing the glasses without trying them. Back Country was very helpful with selection and suggested I order both and see which I prefer and return the other. They arrived, and both fit so well and were of such high quality, I decided to keep both. I bought the sunglasses for competitive sailing and plan to use the Rhino's on more moderate days and Hard Core on the days that really blow with lots of spray. The glasses fit tight, I have even used them without retainers. In a 60 km/h the spray was intense but the glasses shielded me perfectly without water residue. The polarized leneses are fantastic and enhance my ability to see the gusts and waves. Over all, I am thrilled with the products and the service of backcountry.com.