Felt Insoles from the manufacture of Xtratuf boots, Servus. These dual density insoles form to the shape of your feet to give you a better fit in the boot. They keep feet dry by wicking away moisture and insulate feet from the cold ground. They are removable and washable.
Editors note: These are a must have if you have bad feet or have to be in your boots for a lot of hours. They make the most comfortable rubber boot in the world, Xtratuf, even better; helping with arch support and keeping your feet dry, a must in those warmer climates.