Constructed with strong, ultralight nylon webbing for a featherweight feel and big rope strength. The collars are 1" wide. Small = 11" - 15" around, Medium = 13" - 18" around, Large = 17" - 24" around Please measure your dogs before ordering. To find the most accurate size, measure around your dog's neck where the collar would sit. Make sure to leave room to slide at least two fingers comfortably under the collar! If your pup is between sizes and still growing or filling out, we recommend sizing up! Want super-light gear thats still burly as heck? Say hey to our Ultralight Collection! Constructed with strong, ultralight nylon webbing for a featherweight feel and big rope strength. The collars are 1" wide.