Essentials Adventure Collar - Blue Mariner - Medium Medium Blue Mariner Alcott Essentials Adventure Collar is the ultimate collar for your canine pal. Not only is it made with nylon for durability, it also features neoprene padding for comfort. With reflective accents, this collar can be used on any and all excursions, even those late night walks with your dog. 3/4" wide/14" to 20" adjustable length