Our long structured PVC neck corset with thick plastic boning and and adjustable snap front is available in all colours with black or white plastic snaps. For this item XS/small is a 11.5-13.5" neck, medium 13.5-15.5", and large is 15.5-17.5" when the neck corset is fully closed or open a little. If you would like a more comfortable and shorter snap up neck corset please consider our mini version here.