Chair Mats -

Thinner mats (economy or regular) are usually sufficient.

Requires extra thick mats with longer spikes to prevent "dimpling," which is when the chair sinks into the mat, making it impossible to roll. 2. Comparison of Materials Chair Mat Buyer's Guide - MyBinding.com CHAIR MATS

The backing of the mat is the most critical feature to match to your flooring. Thinner mats (economy or regular) are usually sufficient

Look for a smooth-backed mat. Spiked mats will scratch or mar hard surfaces. Regular cleaning under the mat is essential to prevent trapped grit from acting like sandpaper. CHAIR MATS