SIZE:Medium - adjustable from 13' to 21', 3/4' in width. MATERIAL: Made of nylon, covered with webbing, durable and comfortable. CHRISTMAS ATMOSPHERE: Red and green colors with Christmas trees and rhombus, full of atmosphere. BEST FOR LEADING: A D-ring allows you to attach a leash for walking. LEAVE 2 FINGERS: Please your dog before ordering, and make sure to leave 3 fingers between the collar and your dog.