During my first event, the belt worked great and I had no complaints. Right at the start of my second event (a reverse tri), one of the black buttons popped off the belt. Because of where I was standing at the time, I was not able to find the tab again. I had to ask one of the other participants, who was using four safety pins to hold her number to her shirt, if I could have one to secure my number to my belt. Had it not been for her, my number would have been dangling by the one remaining tab for the entire event.