Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Will not stay flat

As other reviewers have noted, it's very difficult to get this to stay flat. It comes rolled up. After several months of leaving heavy objects on top of it (and picking it up and flexing in in the reverse direction), parts of this cord concealer still refuse to stay flat against the floor.The primary thing I want a cord concealer to do is lay as flat against the floor as possible. This product doesn't get that part right.