Ancol's Air-cushion comfort range have padded collars to act as a cushion around the dog's neck. This provides for added strength and absolute comfort. The air-cushion encapsulates thousands of tiny air bubbles giving this remarkable cushion effect. Brass fixings (buckle, D-ring). Select an appropriate size from the collars listed below. Sizing relates to the collars length from buckle to the last hole, i.e. the largest diameter that the collar can be fastened. There are approximately 4 inches of holes for the buckle, so for example, a 22" collar and be adjusted between 18" and 22".