They work perfectly with my bike helmet and sit properly. I like the magical effect & feel of these . What I like about this shoe: nice, and elegant. Slide sandals for some reason seem to give me better support. My only advice is to have two arm lengths of room all around. Again compared to my B&Os they come close, they are AKGs with that said. We?ll see how it goes I first put it on the largest setting but now Ive got it on the second setting. Im just using in my garage - not in the back of a truck like some folks. Now that I know I love them, I just ordered two other colors.