1.SIZE: Extra Large. Neck Perimeter: 23.6'' ~ 27.6''. Chest Perimeter: 28.3'' ~ 35.8''. According to the last picture, please measure your pet and choose the suitable one. 2.NO MORE PULLING,TUGGING OR CHOKING: Comfortable lightweight mesh lining with soft and breathable sponge padding. With two snaps, one goes around neck of dogs and one around body of dogs to keep the straps go around the neck and chest. 3.HIGH QUALITY: Made of highest quality nylon outside. And heavy duty metal D ring can be lead when you are driving or walking. 4.SAFETY WALKING IN THE NIGHT: Reflective material to ensure a visibility at Night. 5.ADJUSTABLE AND EASY TO CONTROL: Adjustable strap allows a custom fit for your lovely dogs. Having a handle at dog's upper back helps you maintain control without a dog leash. And the pictures was taken by size Small.