Buying this product has been nothing short of a purchase nightmare.
Wayfair is operating as the middleman and the product is dropshipped directly from the manufacturer. I had to return this. Not one, not two but three times because wayfair's dimensions in thickness did not match the actual item at the manufacturer (Anji Mt). Eventually with managerial help I basically ordered the "wrong item" (the thinner one that weighs more and costs more than the thicker one which is backwards and opposite of the manufacturer's on website where you can buy these separately) and sure enough finally the fourth time, received the sort of correct rug'd mat. The 0.5" thick one on Wayfair site is actually less than a quarter inch thick.
The 0.25" thick one is the correct one for use over carpet and while it's supposed to be a 0.5" thickness (when laid Flat, NOT when folded in half), It actually measures to 5/16"-3/8" in literal thickness.
When folded in half the product should be a full inch thick but is nowhere near that. What's also strange is the packaging is marked as 33 lb by FedEx but the mat when Wade is just over 22 lb. The box used is wafer thin and weighs at most 1.5lbs. It's actually a flimsy cardboard box to the point where I had to reinforce the taping top and bottom every time I returned one, even though it was the thinner one weighing around 10 lbs.
Ultimately, between the manufacturer advertising a thickness that isn't reality and treating it almost like it's nominal wood measurements from a lumber yard instead of actual measurements of an office chair mat, and Wayfair having the description and weights incorrect, which even FedEx was deceived into thinking is much heavier than they are I guess based on the label (?) the entire purchase took over a month to complete and get the correct item and even then the item isn't as advertised.
Time will tell if it can hold up over medium pile brand new plush carpet that was installed a month ago... Or not, but I hope for the best because there isn't really a better solution besides glass which I'd like to avoid.
In theory, Wayfair may soon fix the dimensions/pricing so this is at least clearer to the buyer but the thicker one has a "D" at the end of the product code sticker on the lower left corner of the box.
The other issue is the cardboard box itself which is covered in branding. Only mentions the length and width but not the thickness! It gives a squared measurement instead of a cubed one, so from the cardboard box you can't tell until you weigh it or open it which one you get!! The "D" is the only thing that separates one from the other (see my pics comparing the stickers on the boxes). Anyway I hope this helps. Somebody else make a very informed purchase decision as these are not cheap office mats. I probably wouldn't recommend buying until the dimensions and pricing are all matching the right product as this situation has wasted a lot of my time, literally hours dealing with Wayfair and returns and customer service and waiting for the FedEx guy, burning up my own labels, etc etc.
Hopefully It ultimately ends up being a good mat for the Long haul.