Make sure to measure your dog?．s girth. Please see the instructional picture below to properly measure your dog?．s girth.Color: Black 、Red、CamouflageSIZE : (Adjustable) Small Medium Large X-LargeS : Fits Girth 17-21 inches (45-55cm)M : Fits Girth 21-27 inches (55-70cm)L : Fits Girth 25-31 inches (65-80cm)XL: Fits Girth 29-37 inches (75-95cm)