I wanted to add my $0.02 here.....

I bought a pair of the Oakley Women's Radars about a year ago. I have a very narrow head and it's rather small, too. The Radars fit me perfectly. Then about a month later I found out my team was being sponsored by Rudy Project and we had to all buy the Rydon II sunglasses and Actyum helmets (currently wore Bell Sweep R helmet). After wearing the Radars and Bell religiously, the RP box came in and I anxiously tried on my new sunglasses and helmet. The moment I took the sunglasses out of the case I hated them already!

The RP Rydon II's were awful compared to the Oakley Radars, in my opinion. They have arrow straight arms, the ends of them have a material that isn't even grippy, the nose piece is the most uncomfortable thing I've ever felt on a pair of sunglasses, and the lens shape obscured a lot of my peripheral vision! In a nutshell, they were extremely uncomfortable and they didn't stay put at all.

The Radars, on the other hand, were the complete opposite. Super grippy arms, very comfortable and balanced fit, the nose grippers actually become more sticky with moisture and lock onto your face, the lens wraps around your complete field of vision, and the lenses also appear to have better clarity. Also, I can't tell you how great hydrophobic lenses are until you ride in any condition that involves precipitation coming from the sky and doing a 3 hr ride without having to touch your glasses once (either to readjust or clean the lens) or have to clean them off afterwards.

In my opinion and experience, RP products were aweful and Oakley is expensive but you can't beat the quality. I tell every person that asks about the Radars - I wouldn't trust my eyes and my vision with any other company.