Switch out traditional laces for elastic versions and turn ANY shoe into a slip on. Works on all styles of shoes, low, hi, boots. Great for those who want an easy on and off. Unstretched lace lengths: • L/XL = ~33.5" (85cm) • S/M = ~21.5" (55cm) • Kids = ~13.5" (35cm) The laces can stretch to approximately double their unstretched length. Each pair of Synch Bands comes with two (2) laces and two (2) Synch Clips, enough for one pair of shoes.