Could not find a way to uncoil the mat. Ended up using a heat gun to soften the vinyl and slowly straighten the mat to get it flat. Experienced the same problem as other reviewers wrote regarding the chair wheels. They easily sink into the flimsy thin vinyl making it difficult to maneuver when seated. Should have gone with a thicker polycarbonate material.
This is the third mat that I have bought at Staples . They last a very long time are easy to clean and allow the chair to role easily. I recommend it highly. I give it five stars.
On a basement carpet without much padding this mat is a bit more soft than I'd expect or prefer. Chair wheels make small divers which are easy enough to roll out of buy enough that it holds your chair in that position until you push your way out. This isn't uncommon with these cheaper mats but disappointinh none the less. On the plus side there is no cracking yet (1 week in)