These are an essential part of keeping your boots lasting great for decades! They do 3 main things: 1.  Pulls any excess moisture from the boot to keep it from damaging the calf lining 2.  Maintains the shape of the boot and keeps it from curling up (damaging the hide) 3.  Keeps it smelling fresh while repelling any pests that want to munch on your beautiful boots. Made from US-grown Aromatic Red Cedar