I am using this item on a carpeted floor for my wheeled office chair. The item came rolled up pretty tight, but wasn’t heavy. Upon opening, I attempted to unroll the mat flat on the floor but it was so stiff I had to call my friend in the room to assist me with getting it to lay flat. With her help, we unrolled it and put dumbbells on each corner to get the mat to flatten. The next morning when I woke up, the mat was essentially completely flat and the weights were no longer needed. My chair glides across this mat with no friction whatsoever. There was an instruction paper in the box saying to use a blow dryer if the item wouldn’t unroll easily, but I didn’t see that until after we had already struggled to get it flat.