Silk is a natural protein fibre containing about 70-75% of actual fibre fibroin secreted from two salivary glands in the head of the silkworm larva, and about 25-30% sericin, a gum which cements the two filaments together.
Cotton is a soft fiber that grows around the seeds of the cotton plant. Cool, soft and comfortable, cotton is presently the world's most used fiber. Every part of the cotton plant is useful and we see its application in industries such as apparel, home furnishings, medical and surgical, automobile, etc.
Polyester is a strong fiber that is resistant to crease, stretching and shrinkage, hence the ability to hold its shape well. Touted the best 'wash-and-wear' fiber, polyester is easy to care for and is washable, hence its wide usage in essentially every form of apparel and home furnishings.
Rayon drapes well, has a soft, silky hand, and has a smooth, napped, or bulky surface. Rayon is highly absorbent but does not insulate body heat, hence making rayon garments ideal for use in hot and humid climates. The durability and appearance retention of regular rayon are low and will wrinkle easily and may stretch when wet and shrink when washed. Rayon also has the lowest elastic recovery of any fiber.
http://www.numei.com/fiberfacts.htm
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