After several months of use, I find that carpet (ScSPORTS Gymnastic mats 60 cm blue / purple) nice and thickness allows not feel the hardness of the ground during the abdominal exercise.
Very good product, a bit bulky, but that's the price to pay to have a rug that is soft, thick and does not deform with use and yet I mistreated, since I do my abdominal posed with a machine since directly.
It is quite durable, though it took a tear here one day, I remember with what. Avoid planting him with blunt objects, including excessively long nails! despite this addicted, it is still in very good condition and perfectly exploitable.
Amusing detail, the foam tends to retain the points where it was supported. it eventually disappeared with time and it does not interfere with the use anyway.
Good sport at all