DOOG's stylish, lightweight collars are made from quick dry, water and snow friendly neoprene so are great for dog's with sensitive skin and hot spots. The neoprene material contains an antibacterial agent and draws moisture away from the skin. BONUS: Comes with a silver doggie ID tag to engrave your pet's contact details onto (excludes Extra Small size). Medium - adjustable from 12 - 18 (0.9 wide) Antimicrobial for the protection of the product Made from neoprene and strong nylon webbing.