Dive hoods are great to wear in cold water conditions. They keep your head and neck warm while leaving your face uncovered so that a dive mask and regulator can be worn. Most of the body's heat escapes through the head so a tight yet comfortable-fitting hood is especially important in chilly waters. In addition, hoods help prevent possible ear problems by shielding vulnerable ears from the constant exposure to cold water.
Like wetsuits, hoods are made out of neoprene and come in different levels of thickness. Thickness depends on how cold the water will be and can range anywhere from 3 mm to 7 mm. The colder the water, the thicker the hood should be. Swimoutlet has a range of hoods available to suit whatever water conditions you'll face on your next diving outing.