Size: M: Bust 39-56cm, Neck 38cm, Back 35cm Size L: Chest 49-70 cm, neck 44 cm, back length 42 cm Different layers of material: the outer mesh layer blocks UV rays, the middle layer absorbs and stores water to take away heat, and the comfortable inner layer delivers coolness to your dog. The high quality material dog cool vest is made of 3D mesh and polymer resin, wrapped by water storage cotton for safety and comfort. All fabrics are safe and non-irritating and are lightweight, breathable and comfortable to wear. Reflecting sunlight and excess heatBreathable, the lightweight 3D mesh reflects UV rays and excess heat. Not only does it provide coolness, it also prevents your dog from getting sunburned. Reflective strip design3M reflective strip reflects light even in low light, so if you walk your dog at night you can see more clearly and quickly where your dog is, which will be saferBeautiful adjustable strapsThe straps at the waist are adjustable to keep your dog from moving around or sliding around while wearing the cool coat. Available in three colours and two sizes to suit most sizes of dog.