As Winter is already the most Yin time of the year, excessive exposure to the cold can cause an imbalance of Yin in the body and organ systems, as the body needs more warmth to function in the presence of cold influences.
During Winter it's important to protect ourselves from cold invasion, this looks like always wearing socks, covering our back (and Kidneys), wearing a scarf and a beanie. These small habits protect our Qi, ensuring we main vital and resilient throughout the colder months.