Size:S Cool Cowboy Rider Style Pet Costume Please measure carefully before purchasing. Size S: Neck length: 7.1-13.8 inches;Chest length: 10.2-17.3 inches Size M: Neck length: 11-20.5 inches;Chest length: 13.8-24.8 inches Size L: Neck length: 19.7-25.6 inches;Chest lengh:25.6-29.5 inches TIPS: 1.You looked at one size chart and found that your dog is a size small. But that doesn’t mean it is a size small for all the clothes. 2.Take each measurement a bit loosely, so there will be room for your dog to move and breathe, but not too loose. Material: Made of polyester and non-woven fabric Feature: Soft and Breathable.