This means if you do not care to pay attention to attaching your rack properly (you need to know a bit about them to be 100% sure) or strapping things on your rack correctly then your chances of something going wrong will increase. I dont like the velcro strap- I tend to wear these with hose and it pulls them plus its clunky- and also the first time I pulled it too tight and got a blister. When on mute it visibly flashes red. Lovely style and fabric They LOVE them. In my experience Id say for people with wider, chunkier feet Id go a half size up - so if you wear a 9. Tons of compliments I have a 23 inch head and it fits snug. Das allerdings wird von den Soundcore noch nicht unterstützt (kommt vielleicht noch? :)). Theyre very comfortable and I never had one fall out of my ear, likee so many other brands do. See video.