The spongy neoprene collar is lightweight, won't rub on your dog's fur and is quick to dry. Small: 25-38cm (9.8-14.9 inch) / width - 15mm Medium: 32-50cm (12.5-19.6 inch) / width - 20mm Large: 50-65cm (19.6-25.5 inch) / width - 25mm Material: Neoprene with nylon webbing. Plastic buckle/keeper. Stainless Steel attachment ring. Care: We recommend hand washing.