Imprint Comfort Mat Croco Series 20-Inch by 36-Inch, Stone 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 won't curl like other mats Non-toxic and phthalate free. Safe for children and pets 7-year warranty. 100% satisfaction guarantee! 91% of consumers preferred Imprint over the leading Gel mat in 6 out of 6 categories tested in an independent qualitative and quantitative study