Shrinkies are keratin protein lined thermal shrink tubing. When heat is applied to the shrinkie, the keratin fuses with the extension and natural hair creating a bond.  The tubing shrinks down and protects this bond.

Shrinkies are a durable and long lasting hair extension method.  Removal is simple.  Simply reheat the bond, remove extension hair and shrinkie and clean any remaining keratin residue with an orange oil or an acetone based remover.