It is a very stiff shiny but not rigid plastic. It was not wrinkled and immediately lay flat. Does not give off any odour. Does everything you would hope a chair mat would. I strongly recommend it.
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.