A. Size: - Size M: Chest circumference ranges from 39 to 56 cm, neck circumference is about 38 cm, and back length is around 35 cm. - Size L: Chest circumference ranges from 49 to 70 cm, neck circumference is about 44 cm, and back length is around 42 cm. B. Three different layered materials: - The outer mesh layer may block ultraviolet rays. - The middle layer can absorb and store moisture and take away heat. - The comfortable inner layer transfers coolness to the dog. C. Materials: This dog cooling vest is made of 3D mesh fabric and polymer resin wrapped with water - storage cotton, which is relatively safe and comfortable. All fabrics are relatively safe and non - irritating, and are also lightweight, breathable and comfortable to wear. D. Reflect sunlight and excess heat: The breathable and lightweight 3D mesh fabric can reflect ultraviolet rays and excess heat, which may bring coolness and prevent the dog from getting sunburned. E. Reflective strip design: The 3M reflective strips will reflect light in low - light conditions. So when you walk your dog at night, you may see the dog's position more clearly and quickly, which is relatively safer. F. Beautiful adjustable shoulder straps: The shoulder straps around the waist are adjustable, which can make the cooling coat fit the dog's body without much shaking or slipping off. G. This vest is available in 3 colors and 2 sizes, suitable for many dogs of different body types.