Randolph Eng Sunglasses.
Got hold of a pair when at a US BX .Never looked back since and dont use the dark visor much any more. .Infact when that perticular frame gave up .I sent it back to them asking if they could repair it .2 weeks later a brand new set ,no charge came in the post!!!!
I use the grey lenses for good colour contrast and they are not polarized.. . <img src="eek.gif" border="0">