Too many chefs I know have serious back problems from all the stand-up hours in the kitchen, so I take floor mats very seriously. These are the best I’ve found. They utilize a proprietary, cross-linked polyurethane material that creates permanent cushioning and buoyancy to reduce joint impact and promote better posture, proper circulation and muscle conditioning for the life of the mat. What’s more, they lie absolutely flat, clean easy, won’t trap bacteria and won’t trip you. They feature smooth, non-slip tops; beveled, no-trip edges; and non-skid bottoms. Great for arthritis, foot and back pain sufferers. Seven-year warranty. Made in the USA. Ships in 7-10 days.