The waist band is stretchy and not squeezing! Bluetooth sounds amazing. Use of hand held screwdriver will sometimes have a better result than use of power tools. With the holes around the shoe it gives good ventilation and my feet dont sweat at all in them. A little difficulty with assembly but very nice Ich muss und werde meinen Ärger jetzt hier lassen: Das Gerät sitzt super am Kopf, das Konzept ist toll der Klang geht in Ordnung - Hifi ist was anderes, aber in Ordnung fürs Fitness. My friend and I each bought two! We tried her in the baby seat before this (copiolet limo) and she felt sooo heavy, and made it hard to balance with her being behind me. No problem whatsoever. ? I gave 2 stars because I still like the look of this style and shipping was fast.