A co-worker of mine had this mat, and used it with his stand-up desk. he let me borrow the mat with my stand-up desk, and after a few days, I was convinced I needed to get one myself. I did and I'm very happy with my purchase. It is quality foam. Not cheaply made at all like some of the cheaper versions. You get what you pay for. Prior to getting this mat, I could only stand for about 20 minutes before my feet and legs became fatigued. With this mat, however, I can stand for hours.