DOOG's stylish, colorful, lightweight collars are made from quick dry, water friendly neoprene so they're great for dogs who love water sports. The neoprene wetsuit material is quick-dry & antibacterial so perfect for dogs with sensitive skin. BONUS: Comes with a silver doggie ID tag. PLUTO = Dark Blue and Light Blue and Light Green waves with a Light Blue underside and Light Blue clip. SIZING: (see sizing chart) *X-Small (puppy) adjustable from 4" - 10" (0.4 wide) *Small - adjustable from 9" - 13" (0.7" wide) *Medium - adjustable from 12' - 18" (0.9" wide) *Large - adjustable from 16" - 24" (1.3" wide)