This office chair mat is much bigger than the standard size so you don't have to worry about your chair rolling off the mat. Also Staples will deliver it free without rolling it up tight. Most mats you order over the internet are rolled up tight so that they fit into a box. They don't unroll very well.
The product said it was for medium pile carpet. I am not so sure. My carpet is within the standards indicated for this product yet my chair (5 wheels) sinks through this product. I would not buy this one again.
The little bumps are not quite high enough--or my old old carpet is getting longer in it's old age! The mat has a tendency to slowly move out from desk. Buyer needs to be sure the 'medium" is what he/she needs
It's so different now not being able to be in person to purchase certain things. This looked normal on line...actually constantly moves/will not stay in place and doesn't support the chair properly. Hoping it may be okay enough to get the job done.