erfect controlOur 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 BuckleSide release buckle is made out of quality eco-friendly plastic with safety lock to prevent the collar from accidentally opening ItAs easier to wear than traditional martingale collars You no longer need to worry about whether the collar can slip over the head Superior MaterialsWe use a silky and soft 100% nylon material so it will not hurt your dogAs 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 LeashOur leash can be adjusted in length from 35 feet to 59 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 sizesS:(12-15 35) M:(14-18 45) L:(17-22 1) Suitable for large medium and small dog Please measure your dogAs neck girth with a soft measuring tape to choose a correct size and leave 2 fingers comfortable space