Measure the Chest Girth, Back Length, Neck Girth of your pet and compare to the size chart before placing an order, leave 2-3 fingers of space for best fit and comfort. Just add water to start the effect of this evaporative cooling vest for dogs. Liquid water to water vapor, temperature drops, bring your dog ice feel. This puppy cooling shirt also prevents the strong sunlight from hot summer and makes dog feel like in cool swamp. HOW TO USE COOLING T-SHIRT-1. Soak the dog vest in cool or cold water. 2. Wring the water out before putting it on your dog. 3. Put this pet cooling vest on your dogs. Perfect for many occasions: walking outdoor, sleep, and daily wear. This dog ice vest comes with elastic leg brims and pullover design, easy to put on and take off. Our cooling shirt for dogs are machine washable and air dry, and will not fade or tear after washed. With this cool pet tshirt, pet owner can then take their furkids to the beach, hiking, training, walking without any worry. Lightweight summer cooling shirt is the perfect way to keep pet cool.