MR11890XLO Size: Extra Large Features: -Neoprene lining for comfort.-Outfitted with heavy duty metal buckles.-Durable collar that is prepared to go anywhere.-Equipped for any environment. Construction: -Constructed of nylon exterior for durability. Dimensions: -Small: 13-17'' L.-Medium: 16-20'' L.-Large: 19-23'' L.-Extra Large: 22-26'' L.