All 3 channels offered the same performance. Obviously overpriced, but also essential. I thought I would only get to use my Keens outside of work. So much so that Im certain a size smaller would not have been big enough. I am UK size 14 and Large was a great fit on me. Disconnect randomly from my phone, at first I thought it was my phone, but tried my other earbuds, non of them disconnect. I got a M and I am 52 with 130 lbs it fit great! Make sure to adjust the width before tightening these down, its easier. Your feet stay warm in them but not overly warm. Soy un amante del buen sonido, suelo utilizar un equipo Hi-Fi en casa y Bose cuando es de uso persona.