This luxurious collar is constructed with hand stitched English Bridle Leather, soft garment leather padding in our signature color, with stainless steel hardware. Fit instructions: Measure your dog's neck with a flexible tape measure. The five buckle holes allow for 11/2 inches of adjustment up or down. Sizes listed are to the midpoint of the five buckle holes. Order one size up if your dog's neck size is between sizes.