Precision Multi-Size Fit:This pet cooling vest offers 4 carefully calibrated sizes, tailored for medium to large breeds. Please refer to the sizing chart before purchaseif your pet falls between sizes, opt for the larger one to ensure a comfortable fit. Tri-Layer Cooling Technology:Breathable honeycomb mesh outer layer for optimal air circulation,Middle layer of water-retaining cooling cotton to lock in chill,Inner cool-touch cooling fabric for instant temperature reduction and UV protection,The three-layer system works in tandem to keep your furry friend cool and sun-safe in sweltering weather. Simple 3-step use:Soak in cold water for 30 seconds until fully saturated,Wring out gently to remove excess water,Put on for immediate cooling effect,For outdoor use, carry a spray bottle to rehydrate the vest as neededprovides 4-6 hours of continuous evaporative cooling to prevent heatstroke. Ergonomic Wear Design:Dual hook-and-loop fasteners with adjustable buckles for quick on/off and dynamic fit, Double D-ring metal clips on the back for direct leash attachment (no need for extra harness), Lightweight, stretch-edge construction eliminates chafing, ideal for high-energy activities like hiking, jogging, and camping. All-Season Pet Cooling Companion:Suitable for both dogs and cats! Perfect for daily walks, hiking trips, road trips, sports events, or even car rides in summer. Just activate with cold water to create a portable cooling zonelets your pet stay comfortable and energetic in any outdoor scenario.