Help your dog to stay cool this summer with an Ancol Dog Cooling Coat. Once the coat has been submerged in water, the lightweight polyester/cotton material willl retain the cooling moisture for several hours before it dries out and requires reactivation, helping your dog to maintain a more comfortable body temperature on hot days. To activate or reactivate the cooling properties of the vest, it needs to be submerged in water for a minute, then gently wrung out to remove excess water and shaken to help it to maintain it's shape. The plastic packaging is a re-usable Ziplock bag, which can be used to store the coat, including when it is already damp - perfect for long walks or days out. The Ancol Cooling Vest is machine washable and is anti-bacterial. Sizing Guide (cm): Collar to Tail XS 25 S 30 M 40 L 50 XL 60 XXL 70 The vest is fitted on to your dog by putting it over his or her head, then fastening to velcro belly strap to secure snugly.