They are all super heavy duty and feel exactly like attachments Id find at a gym. Pushing the sides of the carrier in and tightening further can prevent any strap vibration that can occur (and is really annoying). Ive tried several different types of earbuds and these are by far the most comfortable. The real buckle is a momentary setback, but my girl likes wearing shoes so once theyre on, theyre on. Very low noise, great rejection from behind, and durable construction. Almost dropped my phone a couple of times but I had the ring on and it didn’t fall. Although this is not an issue with this case directly you might want to be aware that cases like these are not good to use on your belt or bag because its way too easy for the top to flip open and the AirPods themselves to fall out. If you care at all about sound dont buy the Betrons, but these. It reports it is full but only lasts a short amount of time at higher volumes. Do want to thank the manufacturer for the spare parts though.