This Blue Tooth unit has excellent sound quality and fits very comfortably on my (large) head. It does what its advertised to do, holding up weights and fits perfectly with the Fitness Reality squat rack. thinks theyre going to come apart on her. However, as I?m writing this, I?m laying in bed in a dark room and feel like I?m an airplane flying through the night. They are pretty true to size, and appear to fit my kids well. Feels cheap, very thin metal. Im a size 10 wide and ordered a 10 expecting to fit it based on another review but that wasnt the case. Skip this if you already know but for the record, there are two types of noise cancelling:1) "passive noise cancelling", "noise isolating", or "sound blocking" means that you have a physical item blocking some, most, or all the sound/noise from your ear canal. Customer support claimed so. Even the straps at the same notch fit differently (left huge, right perfect).