Martingale Dog Collar - Bright Green - Large The webbing is made of soft and smooth nylon Limited restriction on a dog's neck, combining the safety of non-slip collars and the comfort of non-choke ones 4 sizes to best fit your dog Size Regular Mode: Regular Mode: 41 to 64 cm / 16.2 to 25.2 inches - Size Training Mode: Training Mode: 31 to 54 cm / 12.2 to 21.2 inches 19 beautiful bright colors to choose from