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
Thinner mats (economy or regular) are usually sufficient. CHAIR MATS
These require a cleated (spiked) backing to "grip" the carpet and prevent shifting. Requires extra thick mats with longer spikes to
