Stylish, durable, and simple to clean! Made from super strong, smooth flex-poly strap, all-weather materials that are comfortable for pups to wear and dirt- and odor-resistant.Easy to clean, Dirt & Oil Resistant, WaterproofX-Small:Neck Circumference = 7″-10″Strap Width = 1/2″Small:Neck Circumference = 8″-12″Strap Width = 3/4″Medium:Neck Circumference = 12″-15″Strap Width = 3/4″Large:Neck Circumference = 15″-18″Strap Width = 1″X-Largle:Neck Circumference = 18″-23″Strap Width = 1″