Tops are cracking after 1 1/2 years.

I purchased this mat in two sizes for my kitchen 1 1/2 years ago. They are really comfortable to stand on, but a little firmer than a previous brand I had. Still, they are very comfortable. I am reviewing now because both of these mats are getting cracks on the tops, which means I will have to replace them already. (Thus the deduction of two stars...). The one I had before lasted about 5 years.

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