A perfect solution for your escape artists martingale adventure collars offer a more comfortable solution over traditional chokepinch collars. Simply attach your leash to the dring and the collar will automatically tighten as your dog pulls on the leash preventing them from being able to slip out of the collar during your walks together.Reflective stitching. Black neoprene comfort padding. Three adjustable sizes. Metal dring for leashes Available Sizes Small 58 nylon adjusts to fit 10 to 14 Medium 34 nylon adjusts to fit 14 to 20 Large 1 nylon adjusts to fit 18 to 26