Deflecto® Ergonomic Sit?Stand Chair mats. This dual-purpose cushioned mat combines the comfort and ergonomic benefit of an anti -fatigue mat with the smooth rolling surface of an office chair mat. For use with standing desks and adjustable height workstations. The Ergonomic Sit Stand mat is the best anti-fatigue mat for users looking to transition effortlessly from sitting to standing. With 3/8" thick anti-fatigue support foam, this mat is comfortable on the feet. promotes well ness and reduces fatigue. All Deflecto chair mats are GREENGUARD Gold Certified for low chemical emissions and healthier indoor air. Proudly made in the USA. Features a Limited Lifetime Product Replacement Warranty. Patent Pending.