Absolutely comfortable and smart. My chiropractor told me that I need to have a shoe that is a little thick to put some cushion between me and the concrete since I am on my feet all day. On first inspection, the pvc is on a very tough thickness, though I suspect not thick enough to withstand the razor blade sharpness of the teeth of the great white shark. I dont remember exactly what we paid (around $70 I think?) but this is exactly what we needed. Hence, what is printed is VERY small and unreadable. They feel a little snug when I put them on but one wearing and they mold to your foot. Not really a statistician, but I think its about half the times I get the effect I want without trying it over and over. This is SOOO frustrating when listening to a book to find out youve skipped several chapters without even knowing it! I paired these up with the Heka rails for Mitsubishi RVR. It is a little more energetic than the Nagaokas, which are warmer, some could say its a bit bright but Ill see how it sounds after its been run in.