Dogs in Play Multi-Function LED Lighted Dog Harness - Large 22&rdquo;- 28&rdquo; long, 1" wide - Large harness: 22- 28 long, 1" wide Correct Harness Size: The sizes listed above indicate the maximum size with the buckle fastened. Measure your pet's midsection before ordering. You may wish to add 1" - 2" to the measurement for your dog's comfort. Three different light settings allow you to choose based on your activity - Steady On (non-flashing), Slow Flashing, Quick Flashing. Two button compartments allow you to select different light settings for each side of the harness