The arch support slipped around and felt like a lump underneath my arch. NOISE CANCELLING, I would say these headphones cancel about 60%-70% of the noise that the Bose QC35s and XM3s/Bose 700s cancel out (which is really good). Weve tried flip flops and the zipper-back gladiator style - they all leave marks on her feet because she runs everywhere & of course shoes like those arent designed for running. It looks so good with the bronze colored headphones! I have some inner ear issues, so wearing traditional headphones has always been a bit uncomfortable for me. According to the direction there is are screws to hold it together. I saw they offered a few sizes this one was plenty to clear my 2017 Jeep Wrangler spare. I like this book, it has everything I need in one place. If you turn on the blue tooth connection and try to pair, before the communication is established between the two plugs, you may get two connected as two separate devices and wont hear the stereo. We have readjusted them several times but overall, they are just not stable.