I was pleasantly surprised by this hat, it is made of good quality materials, and has plenty of stretch in it. I love JBL and the sound quality, but something just aint right here! love it ! Used stride rites measurement technique from their website. 4) Durable. Easy to use Los controles son intuitivos y de fácil acceso para las funciones “estándar”. The heel height is at a weird angle. We have about 40 wireless headsets across 3 offices, we have 10 of the 920 duo, it works great and everyone loves them. The case looks different then the style in the pictures.