These are fantastic sunglasses. The SR-91 lenses are crystal clear, and the polarization is excellent. These are great glasses when polarization is a must (flyfishing, being on the water or snow, or driving on wet roads).

I own the Hard Kore and also the Kore, and I find myself wearing the Hard Kore more often. The Kore are also great sunglasses, but the lens is bigger. While the bigger lens does a slightly better job of blocking light reflecting from below, they also have less air circulation, and are more prone to fog up. The Hard Kore, OTOH, allows a little better air flow, yet still provides excellent coverage. But by no means is the Hard Kore a small or narrow lens; actually, it's closer to the size of other "normal" shades. As should be evident by the picture, these shades do a great job of blocking lateral light, yet they are much lighter than they appear. Of my (too many) sunglasses, these are hands-down my favorites.

This is an incredible sunglass frame. The Hard Kore frame fits so well and w/ the open lens at the bottom is incredibly functional for any sport. The lenses are outstanding - like the comment below, they are truly like wearing nothing at all they are so clear and efficient. I forget that I am wearing glasses they are so comfortable. I own other brands but find myself grabbing my Kaenons all the time for everything, they are the best.

I got the black frame with medium C28 lenses for playing golf. They are like wearing nothing as far as comfort and the view with the C28 lense is crystal clear in low or bright light with no squinting or eye strain.

I ordered these glasses specifically for golf after watching Brian Gay win a tournament in June. These glasses did not improve my score - however, they have protected my eyes from the sun and wind while not having any distortion and really not even aware that they are on my head. Other glasses required always pushing them back up my nose and usually taking them off before each shot. Not these. They are great, of course they ought to be, and especially the "no frame" on the lower side allows for good vision while looking down at the ball, nothing in the way. A TV doctor said that you should protect your eyes, same as your skin while in the out of doors. Even at $200, I think this is a good buy.

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.