Do your legs and feet a favor and let them walk on heavy duty rubber mats and not the hard concrete underneath. These large mats are very dense and very precisely cut so that each tile easily interlocks with its neighbors - watch the video to see this. The tiles don't tend to pop up at the joins and, perhaps best of all, they are just about odorless. Fitted in front of my work benches they will make life easier on my knees, quieter and maybe even a tad warmer. The box of ten tiles covers forty square feet. Find on the Home Depot website by searching for this unique reference number, 313502622.
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