A natural protein fiber, some forms of which can be woven into textiles. The best type of silk is obtained from cocoons made by the larvae of the mulberry silkworm Bombyx mori. The shimmering appearance for which silk is prized comes from the fibers triangular prism-like structure which allows silk cloth to refract incoming light at different angles. Kashmiri cotton is a soft, white vegetable fiber from ½ to 2 inches long, which comes from the fluffy boll of the cotton plant grown in India. 75% Cotton and 25% Silk.