Replying to Mirrored goggles

now i have noticed that over the past few years mirrored goggles have become VERY popular. my question is, how many people really need them, i mean yeah i know that it does protect your eyes waaay more on sunny days butnot everywhere gets that much sun. i guess im kind of a hypocrite because i have mirrored lenses. but some people will go to extensive lengths to get them and i would like to know if this is just a pro trend or what?