I got a pair of sundogs for xmas.
Used them thrice as i was scared of loosing them.
Now have tied another cord round them for security theres no way these things are getting away. The strap at the back tightens real tight and stays real tight too, but as these are a prezzie gotta be sure.
1st time i used them i thought they were crap as after a while it felt like they were misting up, but no just put too much zinc on my cheeks which rubbed off onto the inside of the lens.
2nd time much better really liked it comfy to wear, no salt crusties, and total sun protection for eyes.
Now wont kite without them, they reduce the glare totally plus i look cooler than i already am....

Overall can wholeheartedly recommend Sundogs they are perfect.