Living in phoenix, we have relatively mild winter so hat's arent necessary during the day, thankfully, as I normally only like to wear one at work where its required, or if out in hot sun of summer for several hours. But winter nights and early mornings, oh boy that's another story. Bitter cold, sometimes even colder than Michigan, where my step mother lives, by a few degeees, at least early morning. That is, once we get deep into winter. Right now it's still just a mild chill at night and comfy warm during the day.