Most people who clicked on this thread already know that every 2-3 years the glasses start getting loose and in most cases will not stay on your head. Not exactly what I was expecting when I bought my pair. Oakley does a tune-up for something a little over USD 50. I made a DIY video where I wrap some Teflon plumbing tape around the loose areas: I am sure most people will opt for the Oakley repair but in my case that would literally cost more than a new pair. (Mailing from Paraguay is amazingly impossible.) So, for me (my head size etc.) the DIY shown in the video made a worthless pair of glasses as functional as new. First DIY so thanks for any likes and comments.