One of the most important features for me is sound quality and thats what set these apart from the other 2. I expected them to be referencing the Ai. Its the biggest factor in only being able to wear them for a short period of time, as it was constantly readjusting the fit from what was comfortable to uncomfortable. Ill be giving the ones that are to little to some little girl at my church. He is growing so big I just try to make it until end of season. I requested a replacement and can hopefully update my review once Im able to use the shoe rack. Very comfortable for my bf. Was very disappointed. He wears a size 8 mens, wider foot. LolAwesome quality !