I got these:

https://www.wileyx.com/EcommSuite/Pr...temCode=SG-1FP

Picked them up new on ebay for about $38. The temples pop off and can be replaced with a strap. The frame is flexible enough to conform to your face and the lenses have gaskets to seal your eye sockets.

I then got prescription inserts from here:

http://www.heavyglare.com/
$70 and they arrived 2 days after I got them.

Overall I love them. I find the gaskets work well not only protecting from wind/rain, but also keep sweat from dripping into my eyes. They still have some fog issues when worn tightly, but some anti fog on the lenses does the trick.

I got them because I was wary about prescription sunglasses, being unable to try them first. These are nice because I bought them cheap on ebay first, and then made sure I liked them before ordering the prescription inserts. Plus on days I wear contacts I can put the original lenses in and use them as regular sunglasses. I also use them in the car as regular sunglasses with the normal earpieces instead of the strap.

-D