Silk fibers are collected from cocoons of the silk worm which is the caterpillar stage of the silk moth Bombyx mori. The silk worms are treated to a luxurious life to produce their cocoons. Their environment is kept at controlled temperatures through their life cycles to insure they will live to produce a cocoon. The worm stage is fed crushed mulberry leaves around the clock, allowing it to multiply its weight 10,000 times within a month.