4Legs4Pets C-GY4040GY 40 x 40 in. Unassembled Pet Cot - Gray with Gray Legs Frame of bend-resistant&#44; powder-coated&#44; 18 ga. cold-formed steel Legs are made of high impact polypropylene plastic Cover is made of the extremely durable fabric Texron; a non-sag&#44; open weave&#44; vinyl covered polyester Lace-up cover can be tightened periodically if necessary Cots are stackable