www.solorshield.com or you can get them at walmart about $20. the caccoons have been changed a bit and the new flex fit just sucks. The smaller your lenses the better otherwise the frame of your glasses and the fitover frame don't mesh. Had mine 4 years.
Fit overs, Cocoons or the Wal-mart specials for 20.00 bucks. I wear the Wal-marts on my bike , in my truck, on the 4-wheeler, fishing, boating, hunting, oh yeah and working too after all I have to pay for my toys.
The Fitovers work pretty well for me on short rides, but on the weekends when I'm doing lots of mileage, I just put my contact lenses in. Can't read very well, but they'll work fine for the bike rides.
Most Walmarts have an Optical Center at the front of the store. They have a Counter right in the center and they are hanging there. Problem with the ones I got, not a good seal and lots of air came up from the bottom. Plus I lost too much side vision and had to crank the head a lot more.