Further clarification, following on from the narrowing of the definition of "waterproof" for this year's LDMT:
"Food" means Bananas (Windward Islands, minimum 17.5 degrees curvature - 'yellow and bent' is insufficient), Blackjacks or Chicken Korma
"Hat" means balaclava, bobble hat (reindeer motif) or Viking horns (+/-Valkyrie tresses).
"Whistle" means the pea-free PheepMaster lll
You may, however, wear flip-flops...