Elastic cords with a smooth T-metal tip on each end of the cord that are inserted into opposite eyelets. The laces are placed under the cord to hold the laces down. The cord helps prevent floppy, loose laces, double knotting and the hassle of unknotting at the end of the day. One size fits most all shoes - toddlers up to senior adults. Each bag contains enough cords (10) for 5 pairs of shoes, plus 4 extra cords for unusual sizes. Free shipping. Lace-Downs are simple, affordable, fast and functional.