Dog show people know all about these things. This mat unfolds to a generous 5-1/2 by 8 feet, and folds up easily again to the size of a brief case. Being of polypropylene (think old plastic soda bottles) it never stains, can be hosed off when dirty, but protects you beautifully from sand and grass when you don't want it. Great for "concerts on the green" for camping or, if you find one, a sandy beach.