Outdoor and Indoor Kennel Mat Size 2 (78x66cm)Outdoor and Indoor Kennel Mat Size 2 (78x66cm) Waterproof Dog Mattress Kennel Liner with Memory Foam PVC Bottom Your standard crate doesn't look all that inviting without a mat or bed. The metal bars might remind you of jail. That's one reason us pet owners feel guilty when we have to put them away. And, even our timber dog kennels would look a lot comfier with something soft on the inside. But we found a lot of mainstream mats weren't tough enough to