The heal area is dipped so your heal sits well in them. I wont wear them, but I will give them to goodwill. So depending on the genre of music youre into, the lack of bass response is either acceptable or a deal killer. The very tips of the flip flop are super thin, and just a tad too long. For my taste it is a wonderful speaker full of rich Bass and controlled highs that arent quite as bright as Id like , but are waaaaay better than a "Too Bright" speaker (see Flip4) that hurts your ears with sharp crashes of sound. Overall a great shoe if you don?t mind that one thing. PROS:- Doesnt seem to impact sound quality- More passive noise filtering, as the memory foam is more insulating - might be a con, depending on your use-case. They skip steps, don?t explain what needs to be done in detail. Good headphones but multi point and multi device connection doesn?t work. that are adorable.