The ultimate folding thunder-paw waterproof dog raincoat is composed of waterproof polyester and super-lightweight nylon. This dog raincoat is adjustable by both the hood and tail-end areas and completely folds into a mini zippered pouch that can be used as a compartmental zippered dog backpack pouch when opened. Features zippered belly Velcro closures for easy on and off access. Convenient for all pet travelers. Available in multiple sizes and colors. Sizing guide: from back of neck to tail area ("in" inches) 8" : extra small 10-12": small 14-16": medium 18-20": large 22-24": extra large.