Pettom Dog Pet Harness Outdoor Adventure 3M Reflective Adjustable Protective Nylon Walking Vest Mesh Harness (Black, Small) High quality nylon oxford cloth with 3M reflective strip,ensure the dog&#039;s safety on the road in night. Adjustable with portable buckle design and very easy to wear off. Do not pull hair or hurt skin with high quality ventilate Leica cloth inside. Thickening nylon ribbon can bear atrong pulling force and not break. S Chest Size: 11.8-16.5 in M Chest Size: 15.7-24.4 in L Chest Size: 20.5-36.2 in