BioThane® Martingale Dog Collar, Training Collars for Dogs Medium (13-16") Size Our Martingale Collars are designed to provide more control than a standard collar and prevents dogs from slipping or backing out and getting free. Also called no-slip dog collars, these unique dog collars fit loosely around your dog's neck and tighten when needed, such as when your dog pulls or tries backing out of their collar. Features: - 1" Standard BioThane (Made in the USA) - Made with Nickel Hardware - Prevents dogs from slipping out of their collar - Limited cinch, and adjustable neck for the perfect fit! - Waterproof - Stinkproof - Wash with soap and warm water *Please note that colours may vary in reality due to different screen settings. **For safety purposes, dogs should always be supervised while wearing collars and all fittings should be inspected regularly.