If I was to improve these I would change the attachment mechanism to the vehicle crossbars to a clamp system similar to the Yakima Jaylows, but that would probably increase the price. These sandals are designed with arch support, which are much better for your feet if you are planning to wear them for longer than a couple hours. Cons:- Cannot answer phones automatically by pressing the button on the headset. I have to wear two layers of socks. 5US and got a size 7. It sounds good for most songs, there are a few songs I found that peaked the headphones even at half volume. I have already destroyed the box, so I dont think I can send it back for the proper size. Now sitting down at your desk, or sitting anywhere, its fine. One unintended surprise is I will use them more than I EVER thought for I found in about 75% of the ones I touched, you cant just go single ear easily without having to do steps to ensure it pairs right the next time to both or bla bla bla. This worked perfectly for our garage and it was worth every penny!