The insulation system combines a micro-perforated felt fabric footbed with a reflective metallized layer. This allows for both heat retention and moisture management, keeping feet warm and comfortable. Features: -They are perfect for fall in a rain boot or a mid-season boot -They retain the warmth as well as keeping the feet from moisture -For an optimal effect in a winter boot, the insole must be placed between the sole of the boot and the inner boot. This adds another layer of protection against the cold and the humidity. -It can also be put in the inner boot to add more adjustment -The same insole can be used in multiple kind of boots