Insoles for cold

A pair of functional winter shoes for me would be a pair of leather sneakers and some nice winter insole.  A trick I learned from the locals while shooting in the north west of China: keep switching socks to prevent perspiration built up from your thick winter boots/shoes.  I once had ice formed from sweat between my feet and socks( I had 3 pairs of socks on because it was too cold, big mistake! ) that I was literally walking on ice all day.  Talk about painful.

Get them from Amazon for $9.58