Dupion is a lustrous silk often woven from two different colors of threads, so that it shimmers or changes color in the light. Dupion is made from an irregular, rough silk reeled from double cocoons or cocoons spun side-by-side which are interlocked, making it necessary to reel them together. Thus it has slubs along the length of the thread where new fiber was added in to continue the thread. Fabric woven with both warp and weft of dupionni is called Dupion, and has random crossings of slubs, producing an interesting texture.