Soft and Comfortable- Our reflective dog collar is made of high density nylon material and soft and comfortable neoprene padded, reducing friction on your dog's neck. Night Safety- Each collar is seamed with 2 high reflective thread that keep high visibility at night for safety. So you can easy find your naughty furry pet in the back yard or outdoor at night. Adjustable P Chain- No buckle design, the main difference between our martingale collar and a regular collar is that the collar tightens when the dog pulls, preventing the dog from struggling from the collar. The Right Size- Please refer to our ruler table. We have 4 sizes to choose, small, medium, large dogs are applicate. Tips: To prevent the dog from biting the collar because of too tightly, Please keep two fingers room between the collar and the neck when wearing for relaxation. Make by Heart- This nylon dog collar dog collar has been worn by my Weimar for two years and not yet break. We aim to provide comfortable and safe accessories for dogs. If you have any problems during use, please contact us in time for a refund or replacement.