I needed sunglass holders because I don't like to wear sunglasses on the back on my head, on the top of my head or dangling from the neck of my shirt.  Guess what?  These Croakies fit the bill, they handled any size sunglass arm with ease.  They were comfortable around the neck, and they made me look cool.  I am writing in the past tense because my wife thought they looked silly and hid them from me.  Now I am back to wearing the sunglasses on top of my head, back of my head.. dangling from my shirt.  Not cool.