Related Clues:

• Glaciers
• Arctic sightings
• Pole features
• Global warming casualties
• Martian features
• Features of Mars and Earth
• Polar layers
• Giant glaciers
• The ends of the earth
• Glacial masses
• Polar opposites?
• Cold headgear, perhaps?
• Big enough to keep a cool head under them?
• That'll help them keep cool heads
• Ones at the pole positions?