Gear for your head is one of the most fundamental items to include into your attire that provides protection from sunlight, heat and cold or various weather conditions.
Headwear for warm days:
Baseball caps, visors, sun/floppy hats, cowboy hats, Boonie hats
Headwear for cold days:
Beanies, trapper/aviation hats, ascot hats, berets, cloche hats