Guardian Gear Reflective Nylon O-Ring Collars 17-21.6 in Royal BluebConstructed with durable high-quality nylon with reflective stitching and high tensile force plastic fittings. The secure placement of the fully welded O-Ring allows for easy attachment of a leash and added security. Made of durable nylon, with full-length reflective tape that reflects brightly in headlights or flashlights for safety at night. Padded Neoprene lining for comfort, and adjustable with contoured plastic buckles.