Introducing the BUCKLE UP EASY HARNESS, designed for simplicity and lightness. This harness is specifically engineered to ensure a comfortable fit without rubbing against the chest and armpits. The contact areas are made from high-density air foam mesh for breathability and softness, promising a snug yet lightweight fit. Its one-touch buckle system makes it effortless to put on and take off, and its two engraved D-rings ensure a secure leash connection. Key Features: Easy one-touch buckle for quick dressing Engraved D-ring for secure leash attachment Breathable air mesh lining for ultimate comfort SIZE GUIDE Size Chest Size (in inches) S 9.84~11.81 SM 11.81~13.78 M 13.78~15.75 ML 15.75~18.11 L 18.11~20.47 XL 20.47~23.62 Choosing the Right Size: For a snug fit, choose S, M, L sizes as per your pet's chest circumference. If extending the harness by more than 2 inches for wear, opt for one size larger (SM, ML, XL) than the original size. Please Note: The BUCKLE UP EASY HARNESS is not adjustable. Measure your pet's chest circumference carefully to select the appropriate size. Suitable size may vary based on your pet's body type and fur length. Measurement method may result in slight discrepancies.