1.Measure before It is highly recommended to measure the widest part of your pet's chest and neck and refer the size chart before placing an order. Don't purchase based on your old experience,It is not suggested to choose the size by weight only. It is ideal for extra-small, small and medium dogs and cats. 2.Breathable,Comfortable, and No Pull and No Choke Dog Harness is double layered soft mesh fabric and built to last.Breathable Air-mesh keeps your dog always cool during outdoor activities, suitable for all seasons,Great for daily walking, jogging, training, and any outdoor recreations. 3.Safety & ReflectiveVest Harness is escape proof when the dog has the correct sizing.Triple security features of strong Velcro closure, Double D-ring&Buckle ensures no accidental detachment.With 360° highly reflective strips and 4 reflective wide bands, a good visibility is provided in the dark. 4.D-ring designEquipped with 4 D-rings, with two D-rings on the left and right sides of the lock buckle top, which is not easy to swing and effectively disperses tension, preventing pets from suffocating. The other two D-rings can be hung with pet ID tags, making it r for dogs to travel.