Our dog coats for medium large dogs are made of more high-quality waterproof fabrics, so when you walk your dog outdoors in the rain, you never have to worry about your dog getting wet.The neck is designed with adjustment ropes to make the dog coat more fit the dog’s body, while effectively preventing cold wind from entering.The reflective strips of the dog coat are designed to provide extra visibility for night walking, hiking, and running. Reflective elements will be very conspicuous in the dark. S: chest: 18.90-22.83 inch(48-58cm); back: 15.75 inch(40cm); recommended weight: 16.5-24.3 lb M: chest: 20.5-24.8 inch(52-63cm); back: 17.7 inch(45cm); recommended weight: 24.2-33.1 lb L: chest: 22.1-29.9 inch(56-76cm); back: 19.7inch(50cm); recommended weight: 33.1-44.1lb XL: chest: 23.6-32.3 inch(60-82cm); back: 21.7 inch(55cm); recommended weight: 44.1-57.3 lb XXL:chest: 26.3-33.1 inch(68-84cm); back: 23.6 inch(60cm); recommended weight: 57.3-72.3lb XXXL：chest: 29.9-39.4 inch(76-100cm); back: 25.6 inch(65cm); recommended weight: 72.3-88.2lbIf you have any problem about goods, such as the defect or size, please do not hesitate to contact us for a full refund or replacement.Your purchase comfort is our desire.May your pets forever be well.