contacted the seller who answered promptly but only to tell me that i could always add more cotton by myself through the zipper

from the review i thought i was getting the most sturdy onebut look at the picture how flat it quickly becameafter one week of daily meditation it already flatttened significantly im 210 pounds

I will certainly look for another brand more sturdy very good

Love that there is a hidden zipper so you can take off the fabric if needed