Material: nylon + metal buckle, Packaging content: contains a dog mouth cover + a link mouth cover and a buckle rope between the collar; Size: S size: mouth 7.7-9.7in, neck circumference 10.8-13.2in; M size: mouth 9.7-12in, neck circumference 12.8-17.2in; L size: mouth 11.6-14.8in, neck circumference 16.8-21.1in; XL size: mouth 14-18in, neck circumference 20.7-25.8in. Stop Pulling - This dog head collar is designed to gently guide the dog's head and then control the dog's direction of movement(similar to a horses halter). Head collar can prevent your dog from pulling the leash, reducing the bad behavior of pulling, jumping or lunging. Walking the dog becomes safer and more enjoyable for you and your dogs. Durable & Practical - This head collar for dogs is made of thick, durable nylon and heavy duty alloy steel hardware. It comes with an assistive leash that can be attached to the dog collar or leash. Dog head halter's firm stitching and reflective webbing design help to protect your dog's safety. Comfortable & Secure - This dog head halter makes your dog feel more comfortable and prevent skin abrasions thanks to the soft neoprene padding on the nose. It relieves pressure on the throat of your dog, prevents the dog from choking or gagging, and allows your dog to bark, pant, eat or drink. Easy to Fit - The head collar comes with quick release snap buckle, so you can wear it to your dog in just a few minutes. The length of the strap is adjustable, you can choose the most comfortable length for your dog. This product will also come with a free training guide to help your dog adapt to it. Worry-free after Sales - The head collar for dog is not suitable for short-snout dogs. Please measure your dog carefully before ordering. The product description provides a guide for a size selection and wearing steps. If you have any questions about our product, please feel free to consult us.