CHOOSE PROPER SIZE: ★S: Neck: 14.2-18.9" 丨Chest Girth: 14.9-24.0"★M: Neck: 15.7-21.6" 丨Chest Girth: 16.5-27.9" ★L: Neck: 17.7-24.4" 丨Chest Girth: 18.5-33.9" ★XL: Neck: 22.0-32.6" 丨Chest Girth: 20.4-37.8". Measure the girth of the NECK and CHEST, then refer to the size chart to find out the correct size. The harness can be adjusted to maximize the comfort of your doggie..MAXIMIZE COMFORT: 100% polyester + oxford fabric, durable and waterproof. Lightweight mesh lining and soft padding on the chest and abdomen for good load distribution and injury prevention. Protects your pet while offering maximum comfort and long-term use. Breathable air mesh allows the dog from sultry after activity..NO PULL & METAL CLIP: There is a zinc alloy ring both on the chest and back of the harness. When dog pulls, you can tie the chest ring to control your dog. When walking with dog, you can use the back ring. No pull design helps you to control, train, and walk the dog better in your daily life..EASY TO USE: With 2 quick-release buckles are easy to use. Also, this harness features 4 easy Adjusting Straps around the body that allows full adjustment which creates a Perfect Fit for your dog. Vertical Top Handle on back for convenient grabbing..SAFE PROTECTION: Losing a dog at night brings a lot of worries to the owner. The Reflective Strips make good visibility in any dark conditions. The conspicuous vest can also make him/her as the search target easily. No more worries about losing during outdoor activities.