Dive hoods provide additional insulation for the head and neck, which are vulnerable to heat loss in cold water. Made from neoprene, dive hoods help maintain body temperature and protect against exposure to cold currents. They come in various thicknesses and styles, including full-face hoods and partial hoods that cover only the head. Proper fit is crucial to ensure comfort and effectiveness, and hoods should be regularly checked for damage or wear that could compromise their thermal protection.