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