PROCOLLAR SMALL. Premium protective collar. Inflatable collar for injuries, rashes and post surgery treatment. X-Small - Fits neck sizes up to 6 inch, Small - Fits neck sizes 6 - 10 inch, Medium - Fits neck sizes 10 - 13 inch, Large - Fits neck sizes 13 - 18 inch, X-Large - Fits neck sizes 18 - 22 inch, XX-Large - Fits neck sizes 22 inches on up.