It arrived flat which is a plus. But it is too thin and even on my low pile carpet my chair has created indentations and the casters get stuck in them. Spend more and get something you will be happy with.
When it became apparent I'd be working at home for a while I realized I needed something to protect our new carpet in my home office space. This mat works as expected although the chair leaves divots in it. But the carpet underneath is fine after being vacuumed.