【Perfect Control】Our martingale dog collar can effectively achieve better control of your dog and prevent it from escaping. It is a must-have for training. The collar needs to be used with a leash and cannot be used unattended for the safety of your dog. | 【Safety Lockable Buckle】Side release buckle is made out of quality eco-friendly plastic with safety lock to prevent the collar from accidentally opening. It’s easier to wear than traditional martingale collars. You no longer need to worry about whether the collar can slip over the head. | 【Superior Materials】We use a silky and soft 100% nylon material so it will not hurt your dog’s neck. 2 reflective stitches with high visibility at night make it easier for you to find your dog. It can make your dog safer. Metal Hooks and D-rings are durable and provide a better connection. | 【Adjustable Leash】Our leash can be adjusted in length from 3.5 feet to 5.9 feet, You can adjust freely to achieve the perfect combination of functionality and comfort. I believe you can feel our innovation in every detail, just to bring you a better shopping experience. | 【Available in 3 sizes】S:(12"-15", 3/5"); M:(14"-18", 4/5"); L:(17"-22", 1"), Suitable for large, medium and small dog. Please measure your dog’s neck girth with a soft measuring tape to choose a correct size, and leave 2 fingers comfortable space.