These days, wool is still used, but so are more flexible fabrics like fleece, as well as synthetic ... face coverings, or neck gaiters. While a balaclava is ostensibly for winter sporting purposes ...

The mid layer is for insulation — a good fleece or down jacket will do ... Head-to-toe essentials: Neck gaiter or balaclava, shell jacket and pants, gaiters, -10°C or lower rating sleeping ...