Characteristics of Twine Fibers Quotation Request Form FAQ Twisted Cotton Twine Cotton twine is made with either 100% natural cotton fiber, or with a combination of natural cotton fiber with synthetic fiber such as polyester100% natural fiber has a soft feel – easy on your handsHold knots very wellWill absorb waterWill sink in waterWill rot – is completely biodegradableMuch less strength than synthetic fibers such as nylon, polyester, or polypropyleneHeavier than most synthetic fibersCan be dyed different colorsIdeal for use in trot lines, crafts, or anywhere a soft, biodegradable twine is needed