This comfy 2 in 1 fleece bed has four sides which are connected to each other with a zipper the zippers can be individually opened as needed leave unzipped to create a cosy nest bed for curling up in or unzip all the sides to create a huge one level cushion perfect for stretching out on or why not try just two sides unzipped so your dog has room to stretch and a comfy corner section to rest his head its up to you the grey outer cover is made of nylon and is smooth and tough this helps to