Ski boots manufacturers progress and improve their products every year with new liners offering better insulation and more comfort. But some skiers like to add their touch with an extra pair of insoles enhancing comfort and insulation up a notch. The ski boot insole offers an ergonomic bed for your foot with more hold in case the boot is a touch too large. It is also a good option if you want to feel warmer in your boot. Coated with aluminium, the sole retains the heat better. You can even go for the self-heating insole and its batteries if you are really sensitive to cold.