Bests & Worsts Reviews from Amazon

First and most important that buyers need to be aware: you CANNOT return this item. The knob that adjusts the headband's width does not work; the whole thing keeps sliding down my face no matter how many times I adjusted the knob that's supposedly tightening the headband. As soon as I requested a return, then that's when I found out this item is not returnable! The problem is that there's nowhere on item sale's web page indicating that the item is non-returnable. If it makes it clear to me when I considered buying it, I would not have purchased this item. The reviews of this item are mostly good. This tells me that I can't trust the reviews posted on Amazon.