Comfortable to Wear - The inside of the collar is lined with soft cushion for extra comfort, which protects your baby’s neck while being strong enough to withstand hard exertion. Sizes - Four sizes from XS to L available for different sizes of dogs. Please refer to the description below for the ideal size for your puppy. For size chart, please see image 3. Convenient Design - A ring is available for you to attach tags, pendants or accessories. Material - PU Leather + Soft Cushion, which leads to better strength and won’t tear your hands or pick up hair like nylon leashes. Additional Gift - Comes with a puncher to adjust the ideal size for your pup at different ages.