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 hook and loop closures for easy on and off access. Convenient for all pet travelers. Sizing Guide: (From back of neck to tail area)