ADVANCED COOLING TECHNOLOGY: The advanced technology that makes up this pet cooling vest is seriously impressive Simply submerge the vest in cold water for 5-8 minutes and then wring out any excess water. The cooling process is now activated and will keep your pet cool for 4-6 hours. After 24 hours the vest will become dry and stiff, simply submerge in water again to restart the process.KEEPING YOUR PET COMFORTABLE: As a pet owner, we understand that on hot summer days your main concern is keeping your pet comfortable. Thats why these vests are the perfect solution for keeping your pet from overheating when lounging outside, long trips in the car, long walks and even throughout mild summer nights. The vest also has a reflective coating so is perfect for keeping your dog safe on walks at night time too COMPLETELY PORTABLE: These vests require no electricity and keep their cool simply when activated by cold water. They are light and durable, so your pet will stay comfortable while wearing it.LESS SHEDDING: When your pet becomes too hot, they naturally shed their hairs as a way to cool down. Keeping your pet cool and comfortable helps to reduce this shedding process allowing your home to be cleaner, more hygienic and free from any excess hairs.4 SIZES: Choose between Small, Medium or LargeXL Large.