This is shipped folded. Instructions state "allow to come to room temp for 24 hours before attempting to unfold so that it does not crack." Let's say 72 hours and then getting so frustrated that there was no change so that one must forcibly use a series of increasing weights to eventually flatten the mat. This solution was perfect because it is not as if anyone has to work a full-time job -- really just focus on chair mat flattening. Works now but requires a lot of patience a sense of humor and a good demeanor. Would recommend for an office pool. Buy two mats. Set an over/under on amount of hours needed to flatten with assistance and without. Great distraction. Can use Zoom to measure for those of you that are still working remotely.
Mat came rolled up in box and has been on floor for 5 days now and still isn’t flat I’ll give it a few more days to flatten otherwise is being returned