Innovative SuperGrip smooth bottom surface chair mat replaces sharp studs and sticky adhesives to hold mat firmly in place on carpet or hard floors. Gently protects multiple flooring types from normal wear and tear, and damage caused by chair casters. Easy glide rolling surface improves chair mobility and helps reduce leg and back strain. Recommended for use on low-pile carpets up to 3/8" thick, and hard floors. Made from our Free and Clear non-orthophthalate, non-cadmium formula that promotes a healthy work environment, while offering exceptional clarity and durability. Greenguard Gold Certified for low chemical emissions.