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Use mats with a smooth back . Spiked mats will damage hard floor finishes. The "Paperclip Test" for Carpet

Straighten a paperclip and push it through the carpet and padding until it hits the subfloor. buy chair mat

Use mats with grippers or cleats on the bottom to anchor the mat in place. Use mats with a smooth back

Mark the point flush with the carpet surface and measure that length. Requires a standard thin mat. Medium Pile (Up to "): Needs a thicker mat with slightly longer spikes. High Pile (Over buy chair mat