dude you gotta get bobsters off of ebay...$30 and they change tint with the sun, they come with a strap so you can change between sunglass fit or goggle fit, come with a case, and a little shammy and ive had them for like a year now and no problems what so ever

heres the link to the search on ebay
http://search.ebay.com/search/search.dll...&category0=

and the link to the ones i got that change tint

http://cgi.ebay.com/ebaymotors/Bobster-R...sspagenameZWDVW

and heres the website
http://www.bobster.com/