Hard hats are important for all around head protection, but for protection from the cold weather, nothing beats a winter liner!
Winter liners are a great way to take the bite out of outdoor work in wintry conditions. There is a wide array of styles to choose from. While all are designed for warmth, many are made of fire retardant materials providing an extra layer of safety as well as warmth. The longer nape or cape styles also offer more coverage from the cold and other elements. Hard hats are easily secured with convenient Velcro strips.
Liners with removable mouthpieces provide protection for those working in extremely cold conditions. And the Velcro strips, which secure them, make the mouthpiece easy to remove when necessary.