EDEA Skating Laces are some of the very finest laces available. They are similar to a parachute cord, but without the filler. The Laces are a combination of Nylon, Polyester, and Cotton to help keep Skates Tight and are VERY Strong Made of the finest flat tubular polyester. Tangle-resistant. Sturdy, long ends to ensure easy threading. Laces should be changed as soon as they lose their texture and elasticity (this causes them to loosen), every 3-4 months.