I was very excited to receive My new Revo’s to use on my trip. But it went wearing as soon as I tried them on. They were completely loose on my head to where they would not even stay on my head. I wear hats they’re seven and five eights which is basically a large head. But these would not stay on my head. I ordered these four weeks ahead for my trip and was not able to use them one day even for a minute since they were Prescription I did not want them to fall off and damage them.. first time I’ve ever been satisfied with the Revo. I have six other pairs of ribs that I have accumulated over 20 years and this is the first I ever had such a horrible experience..