A nice red wool hat similar to the classic watch cap for winter. When I need to keep sun/rain off my head in summer, I have a wide brim tilly, and my go bag has a now well crumpled boonie cap that has a LOT of 550 cord laced around the rim, for those times I don't have a hat, and suddenly need one (A brimmed cap keeps the rain off my glasses, and makes life a lot safer)