Spindrift Cozy Martingale Dog Training Collar Size guide: Small-(3/4" x 12-15"), Medium-(3/4" x 14-19"), Large-(3/4" x 18-25") Designed and manufactured in the U.S.A. by outdoor enthusiasts using climbers grade materials for optimum function, strength, and durability Tubular webbing makes this nylon collar incredibly strong while the cozy 200-weight fleece lining provides some cushion and width for sensitive necks Collar design provides effective training without the harshness of a chain Martingale collars are for training only - Never leave on a dog unattended