The collar has an adjustable strap to fit your medium breed comfortably. The reflective strap helps with visibility at night. Featuring a formfitting and lightweight design, this SaharaCase nylon collar provides a snug and secure fit.Compatible with Apple AirTagKeep your dog safe using the Apple AirTag technology.Triple nylon materialFeatures reduced stretching and yellowing and guards against scratches and dirt.Reflective strapIt can be easily adjusted from 14" to 16.5" in diameter. Helps with visibility at night.Formfitting and lightweight designProvides a snug and secure fit.Apple AirTag sold separately.