Tatami.
It is a Japanese floor covering. Made of "Igusa" rush.
Look it up online.
It is also a green product.
Very good.
We have that in our home in one of our rooms.
My kids love it. As do we.
Now, it is not plush and all soft. Like a rug.
It is a firmer, floor covering.
But Japanese people, actually sleep on it.
It even helps people with back pain etc., allergies, and is very healthy.
It is sound absorbing as well.
It is hypoallergenic
Here is a link on it:
http://www.tatami.com.my/prod01.htm
I highly recommend it.
It is very popular now... because of its health benefits, and being a green product.
Be aware, that there are cheaper versions... but these are inferior. It has to be made of "Igusa" rush.
http://simple.wikipedia.org/wiki/Tatami
Or there is this: (foam tatami)
http://www.fighters-inc.com/trocellen-puzzle-tatami-mats-...
http://budoguten.futagotrader.com/tatami/
All the best,
Susan