Cowboy Rider Costume Material: Made of polyester fabric Feature: Soft and Breathable. Please measure your pets carefully before purchasing. Size XS: chest size 8"-13.5"; neck size 5"-9.5.Size S: chest size 13"-20" neck size 6"-17".Size M: chest size 20-26.5" neck size 12"-18.5".Size L: chest size 29.0"-33.5"; neck size 19"-25.5"Size XL: chest size 32.0"-38.0"; neck size 24"-30.0"TIPS:The measurement of your pet can be increased by an inch so your lovely pet can move freely.