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Shoelaces, which are also called shoestrings, shoe laces, or boot laces, are a system, commonly consisting of pairs, used to secure shoes. The shoelace can be untied and loosened, permitting the shoe to open wide to admit the wearer's foot; it can then be tightened and knotted into a bow-shaped knot, called the bowknot. Shoelaces did not become widely popular until the 20th century. Modern shoelaces often incorporate various synthetic fibers, which are generally more slippery and thus more prone to coming undone than those made from traditional fibers.