The Original Sporn Training Halter for dogs is designed for moderate to heavy pullers and is guaranteed to stop your dog from pulling instantly, using the patented "Sporn Effect". It's made of high quality, braided cord and nylon webbing, with thermoplastic and nickel-plasted steel fasteners to reduce weathering. It's padded sherpa sleeves provide maximum comfort and prevent underarm chaffing. Instantly Stops the Hardest Pullers Converts to a Standard Collar if the Pull Function is not Needed Guaranteed for the Lifetime of the Dog (Excludes Chewing) Sherpa Sleeves for Maximum Comfort