This is a 4-star review you because the initial gsx1000 that I purchased produced a loud hiss when there was silence in the background. I bought one and CL16 arrived then asked for a replacement and CL16 arrived again. However, one thing that is a must is a phone mount. Ordered a 7 and it’s like a 5. Ive been a Grado fan for a long time. Initial impressions are that this was a great waist ”trimmer” support belt at not only a great deal but overall construction, fit to feel. For me personally, this seems like a bad idea. I mainly got this so this won’t move around in my pocket with my phone in it (and scratching up the surface). good quality good fit and certainly makes you sweat my daughter bought it for when shes running and stays in place she is really happy with product Im a huge fan of the Kate Spade brand and this airpod case is super cute and the material is great, i’ve gotten so many compliments.