PREMIUM QUALITY: Our Mighty Paw nylon martingale collar is constructed with premium quality nylon and features reflective stitching to provide the ultimate balance between durability and functionality. SIZE OPTIONS (see size chart in images for reference): Small: 12 to 14" neck (.75" width) Medium: 14 to 17" neck (1" width) Large: 17 to 22" neck (1" width) TWO COLOR OPTIONS: Grey or black VERSATILE: This martingale-style cinch collar features two D-rings. This provides a second non-cinch leash attachment option, allowing the martingale to function as a normal collar as well as a cinch collar. SAFE: This modified cinch collar is designed to make training safe and effective; the collar tightens under tension but only enough to provide subtle training cues. TRAINER RECOMMENDED: Recommended by dog trainers for gentle control while your dog is on leash. This collar is more gentle for your dog compared to a traditional choke collar. BORN IN THE USA: Mighty Paw is family owned and op