After buying a piece of crap from Amazon which was returned today. even while its cleaning ink head you can see the ink gauge is decreasing quite rapidly. It snugged. The inner foot bed is made with a nice spongy memory foam over a more rigid foam and includes an additional heel pad inside the construction of the inner sole. Maybe I should have returned them and bought the next size up but I didnt have time before going away and In any case I had bought my normal size so was expecting a better fit. My money would have been better spent on something else I ordered a 5 because he wears a 4 now, even one size up was not enough, he has to wear a very thin pair of socks. This is a personal thing, but at high volume my ears start to tickle. So you WILL SACRIFICE low frequencies. They are so comfortable in the ears that you barely feel them which means less irritation.