So many of us assume that the only time our locks deserve a little TLC — a smother of coconut oil, a drop of shea butter – is once they've been frazzled by the burning sun and dipped in sea salt. Once summer is over, you switch to richer conditioner, slip on a beanie and voilà. But that won’t be enough. Frigid temperatures outdoors, central heating indoors and biting winds can do just as much damage to your hair as 12-day beach vacay. To help, we’ve rounded up oils formulated with the most nourishing ingredients including avocado, olive or argan to oil, to keep your hair hydrated over winter — despite the blasting heat of the hairdryer. Click through for our picks.