1.Measure before - This harness is only suitable for small dogs and cats, don't purchase based on your old experience, please always measure the widest part of your pet's chest before . If the chest girth is between two sizes, we recommend you to choose the larger size. DON'T CHOOSE SIZE BY WEIGHT ONLY. 2.Easy to use & Quick release- Our Step-in harness is very easy to put on and take off with the fast-release buckle. Put the dog's front feet into the holes, close the magic tape fastener, then snap the buckle, attach the leash to D-rings, finished. 3.Breathable & Comfortable- This harness is made of high density soft Air-mesh to protect your dog's skin, breathable, lightweight, comfortable, Sturdy, easy to clean and quick-dry. Breathable Air-mesh keeps your dog always cool during outdoor activities, suitable for all seasons, your dog will enjoy the daily walk in this style fantasy harness. 4.Safety & Reflective- Super 360°highly reflective stripes is designed to reflect ambient light under extreme low light conditions, it can provide maximum visibility when dogs walking at night. Our No-Choke dog harness can distribute the pulling pressure evenly to the dog's body and protect dog's trachea and throat from pulling and choking.