Imprint CumulusPRO Professional Standing Desk Anti-Fatigue Mat 20 in. x 30 in. x 3/4 in. Brown Top Rated Standing Desk Anti-Fatigue Comfort Mat - Up to 97% thicker than other mats! Environmentally friendly, non-toxic & phthalate free, Safe for children and pets CumulusPRO Mats are made with Cushion-Core Technology to reduce fatigue and increase comfort and productivity. Tested and certified by the National Floor Safety Institute & an American Chiropractic Association (ACA) Partner. Contoured beveled edge design and no-curl edges reduce trip hazard while the non-slip bottom keeps mat in place. Solid, one-piece polyurethane construction and a high-density core that's guaranteed not to lose support over time Lifetime Warranty REAL reviews by REAL customers: We do not pay third party review companies to influence our reviewers like many of our competitors. Honest and unbiased reviews.