About 25 years ago I purchased a 36x45 mat for under my home desk chair. It was just the right size and perfect for the job. And after only 25 years of daily hard use imagine it began to crack. I was delighted to find the exact duplicate in the same Staples store where I had purchased the original one. Thanks it's great.
Found the bare mat in front of the garage with a sticker that said "Read instructions before unrolling"! It was very dirty. After wiping with paper towel and two passes front and back with a steam mop it was fit to use.