Size S - neck girth: 9.8", chest girth: 12"-16.5". Size M - neck girth: 12.5", chest girth: 14"-19" With 59" in length leash, perfect for walking, hiking, running, and other outdoor activities Made of high-quality material, soft and comfortable to wear. Black& red plaid design Self-heating layer in the middle, brings proper warmth for your pet, especially in winter With quick release buckle and adjustable chest belt, provides security to keep your pet safe