My original Staples chairmat finally gave up the ghost after 6 years so I bought the thickest one they could sell me -- even though my high-backed chair is on industrial grade (read: thin cheap) carpet. I overbought to minimize splintering due to the effects of ozone on plastic goods. I'm glad I did.[...] This mat probably weighs a good thirty-five pounds and unlike the comments by others that their mat was rolled this was perfectly flat. It doesn't bend. It can't. It's too thick.The beveled edge isn't too beveled but that's a problem with my expectations not the mat. You can't make the beveled edge too thin else it will stress and flex when the chair wheels drop off onto the carpet (that's what cracks your mat). This edge was designed to prevent that - and there's no problem transitioning my chair from mat to carpet.I'm glad I went beyond my immediate need -- choosing the extra thickness of this mat was one of the best decisions I have made. The mat doesn't bend under my weight (I'm 185 and my chair's a good 40 lbs) and I'm confident this mat will last longer than the one it replaces.[...]
We may have to return this because it affects my allergy-based asthma. The off-gassing has lasted a week and is diminished but not gone. Otherwise an adequate product.
Too thin for use on the thinnest commercial glue down carpet. Save yourself the trouble a spring for the better (thicker) one. My husband bought it because it was 50% off. Now we know why.