Well-ventilated, light and durable. Adjustable leather straps wouldn't stratch Well-fitting, comfortable muzzle is made of high quality genuine leather, trimmed and riveted for extra strength. Dog snout measurements: circumference 11.8"(34cm), length - 3.5"(9cm). The middle adjustable muzzle strap forms a loop around your dog's regular collar to ensure the muzzle will always remain securely in place. This size generally most suitable for Large breeds like Rottweiler, Golden Retriever, or other breeds with similar snout structure.