It was very hard to unravel they way it was shipped and the edges do not lay fat on the carpet even after being down several days. It is very thick though so Iit has not craked like cheaper floormats.
Sent to work-from-home I put my work computer on a table next to my home computer and moved back and forth noticing that my chair was wrecking my Berber-style carpet. I ordered a mat from online and was surprised that it came rolled up like wall paper. When installed being too soft it DID NOTHING even though I had chosen a thick one. Sent it back ordered this one from Staples- which came shipped sort of curled in half in a large box - but no worries. Set it down it flattened out the teeth held it in place. It's butted up against the mat at the home computer desk and my desk chair can roll back and forth without catching at the crack or damaging my carpet. Success! Would buy it again.