Using the Curli Clasp Vest Air Mesh Dog Harness is super easy. First, adjust the Velcro fasteners to fit your dog's body shape and size properly. Make sure it's snug but not too tight. Then, use the single - hand attachment to connect the leash to the harness. Your dog is ready to go! When it's hot outside, you can soak the harness in cold water for a few minutes and then put it back on your dog for extra cooling. As for maintenance, simply hand - wash the harness in mild soap and water. Let it air - dry. Don't use a dryer as it might damage the air mesh material. Also, regularly check the DogFinder ID to ensure it's in good condition and the serial number is still readable. If your dog grows or changes in size, readjust the Velcro fasteners accordingly to keep the harness safe and comfortable.