The bar is slightly narrower than the frame. I do not flex in size. Its also too long to allow the locking tabs to fall into the notches on the light. I literally wear flip flops daily. Bought for my son-in-law and he said its wicked. Game changing. Adequately cleanCons:1. I?m a manager and I?m on my feet 12 hours out of the day and they work amazing I bought at least 4 different foam tips to try and make my AirPods Pro?s fit, to no avail. Its worth recommending.