The “Beast” Series collar provides the highest level of strength, function, and durability. The “Beast” starts with the AustriAlpin 1.5” D-ring cobra buckle, and is built out of 2 layers of 1.75” webbing, and 1 layer of 1.5” accent webbing. Each collar has a 7” area of loop Velcro for name tapes and/or I.D. panels. This combination ensures that the “Beast” Series collar will meet the needs of every dog and handler. From civilian, to military and Law enforcement to service dogs. To properly size your dog, using a soft tape measure take his/her measurement to the tightest point desired. That number plus 2” is your dog’s final measurement Medium – 17”-21” Large – 21”-24” Ex Large – 24”-27”