The first thing I noticed while wearing these sunglasses is how much better it is to have polarized glasses. I have never invested in a solid pair of glasses, and usually just wear a hat to keep the sun out. Polarized glasses are amazing, Ryders saved my eyes from the sun, the lens are amazing against battling glare. As for scratch resistance, I am really excited to see how these test in the summer while mountain biking, because they came out of this testing not scratched.
The ryder sunglasses are built from a tough material. Both shatterproof lenses and scratch resistance coating. I wore the glasses around for a few days of normal wear and some skiing, but so far they have come out of it unharmed. It was nice to actually be able to wear sports sunglasses in public without looking like a power ranger.
Fit: The size chart can be found here: http://ryderseyewear.com/node/10720 and they are true to its size chart. The arms were nice and tight around my head, so they fit under my helmet okay, but I would recommend trying them on first if you plan to wear them under a helmet. If you ride with no ear flaps, they should be perfectly fine. They were great at not bouncing around on my face, cause everyone knows that can be one of the worst things sport sun
Overall, for the price they retail at, I really suggest picking up a pair if you need durability and high quality lens to ski/ride/chill with, I really enjoyed testing them out in the cold, and cannot wait to rock them for spring skiing.