Although there is gripping on the bottom, it does not feel secure enough to keep my feet from sliding. All in all, I am happy with the headset for the price. They held together amazingly. Do not charge the cell phone and airpods at the same time, I put the cell phone and airpods even after a long time does not charge, even after the cell has 100% charged battery. Potential counterfeits. 2) because of the pivot mechanism its a bit wobbly, yet you still can read your workout data. I did want to note that all I ever seen in stock where the sizes labeled narrow. I did test it with full base to get an idea and it certainly would not disappoint people who love base heavy music. El envio a México desde las Las Vegas, rápido, llego en 3 días. If you have never owned Sennheiser earbuds, then you have not owned high-quality earbuds.