Related Clues:

• Liters of soda have them
• 'UH-OH, I THINK MY ___ LOCK IS ON!'
• Locks toppers
• Spots for team insignias
• Feature of the last word in this CLUE
• Tops of toothpaste tubes
• What OPEC and NATO are both in?
• Parts of bottled sodas
• Cardinals block the sun with them
• Baseball players' headwear
• Rounds out, as an event
• Opposite of all lowercase
• Many ball players wear them
• MLB sun blockers
• MLB sun-protectors