ZippyPaws - Cooling Safety Vest for Dogs with High-Visibility Reflective Stripes HIGH VISIBILITY - This brightly-colored, reflective vest ensures that your dog will be safe and visible, even in low-light conditions. Two reflective stripes provide maximum visibility. COOLING TECHNOLOGY - Long-lasting cooling polymer crystals, which are sewn directly into the vest, absorb water and slowly evaporate to help keep dogs cool for hours. EASY TO USE - To activate cooling features, simply soak vest in water for 3-5 minutes before use. Squeeze out excess water. NO FUSS - Simple hook-and-loop straps make it easy to put this vest on even the most finicky dog. PERFECT FIT - Available in 3 sizes to fit all dogs - Small: 16 - 24" in girth; Medium: 23 - 32" in girth; Large: 30 - 40" in girth.