GameWear NCAA Oklahoma Sooners Reflective Football Collar Neck Sizing Chart: Toy fits 6 - 10 inches Small fits 10 - 14 inches Medium fits 14 - 20 inches Large fits 18 - 26 inches Reflective Material Officially Licensed Eck Sizing Chart: Toy fits 8 - 12 inches Small fits 10 - 14 inches Medium fits 14 - 20 inches Large fits 18 - 26 inches Wear your love; wear the game 100% Reflective