Imprint Cumulus9 Croco Series 20-Inch by 36-Inch Mat, Goose #1 Consumer Rated Comfort Mat - Up to 60% thicker than other mats! University tested and proven by the Center for Ergonomics to reduce overall fatigue and discomfort by up to 60%. No-curl edges and stay-flat memory ensure Imprint Mats wont curl like other mats 7-year warranty. 100% satisfaction guarantee! Environmentally friendly, non-toxic and phthalate free. Safe for children and pets. Tested and certified by the National Floor Safety Institute & Endorsed by the American Chiropractic Association (ACA)