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I call this a fitness mat instead of a yoga mat because it is much thicker than your standard yoga mat. I have used this on asphalt parking lots and not had any hard pieces poking my back or knees. I got mine at Target at least 5 years ago and it is holding up really well. As you can see it rolls up nicely and can be thrown into a closet without taking up too much room. They still sell these at Target in the fitness section. I think it was around $15. I haven`t seen a mat this thick anywhere else.
Pic is mine.