Size: Size M: Bust 39-56cm, Neck 38cm, Back Length 35cmSize L: Bust 49-70cm, Neck 44cm, Back Length 42cm 3 different layer materials:The outer mesh layer can block ultraviolet light, the middle layer absorbs and stores water,takes away heat, comfortable inner layer transmits the cool to dogs. High quality materialsThe dog cool vest is composed of 3D mesh and polymer resin wrapped by water storage cotton, which is safe and comfortable. All the fabric are safe and non-irritating.It is also lightweight, breathable and comfortable to wear. Reflect sunlight and excess heatBreathable & lightweight 3D mesh reflecting ultraviolet and excess heat. Not only can provide coolness, but also prevent your dog from getting sunburned. Reflective strip designThe 3M reflective strip reflects in low light, so if you walking dogs at night,you can see the position of dog more clearly and quickly,It would be more safer Beautiful adjustable strapsThe straps on the waist are adjustable, allows for a snug fit that will not move around or slide while your dog is wearing their cooling coat! Available in 3 colors and 2 sizes, it is suitable for most body types of dogs.