The Frost King faucet cover protects outdoor faucets from freezing in cold, windy weather conditions. Made of foam, The Frost King Faucet Protectors can provide insulation for outdoor faucets throughout the winter. Plus all year long, they keep the outside air from leaking into your home. All necessary hardware and simple instructions are included: a 5/8-inch expanded polystyrene shell, a 3/4-inch one-piece foam gasket, and a non-heat conducting synthetic rubber ring with adjusting lock that attaches to the faucet.