Cocoon : Silk :: Hide : ? Complete the analogy.

The first word names the raw material and the second the finished stuff made out of it: silk is drawn from the cocoon of the silkworm, and leather is made by tanning hide. Wool is shorn from a fleece and never comes from hide, jute is a fibre from a plant stem, and ivory is carved from tusks. All three are real products, but none of them is what hide becomes.