A:Answer Hi HarleyRider, These in-headphones have an ergonomic surface design for a better fit and are designed to stay into your ears comfortably when using the right size of earbuds and wearing them correctly under normal usage. Check here for more details: https://helpguide.sony.net/mdr/wf1000xm4/v1/en/contents/TP1000237901.html.
Unfortunately, we cannot guarantee if they will still stay in your ears when riding a motorcycle, especially when you are not wearing a helmet. Strong wind may affect your overall listening experience and may cause these headphones to fly off. You may want to wear a helmet if you are planning to use these when riding a motorcycle. I hope this helps! Vincent