Innovative, SuperGrip Chairmat features a smooth bottom surface that replaces sharp shards and sticky adhesives to hold the mat firmly in place on carpet up to 3/8" thick and hard floors. Easy-glide, vinyl rolling surface improves mobility and helps reduce leg and back pain. Free and Clear formula is made without ortho-phthalates and cadmium to promote a healthy work environment while offering exceptional clarity and durability. Chairmat is Greenguard Gold certified for low chemical emissions and is part of the USDA BioPreferred Program for biobased content.