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Xtenex - The Lace of Genius
The unique design of the Xtenex lacing system solves the problem of lace migration. Xtenex laces have an elastic core and a series of knots along the entire length of the lace at consistent intervals. Stretch the lace and the knots disappear, allowing you to thread the lace through the eyelets. Release the tension and the knots reappear. More knots between eyelets lessens the tension; fewer knots between eyelets increases tension. This technology enhances footwear fit, comfort and performance.
Sizing: we recommend the 29.5" laces for women's shoes and men's size 12.5 and smaller.
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Sizing: we recommend the 38.8" laces for men's size 13 and larger.