Speedlaces Zero-Friction fittings eliminate lace friction and laces flow thru your shoe. Remarkable things happen: lace tension is uniform throughout shoe for incredible comfort, support, and stability. The fit and feel of entire shoe adjusts instantly. Shoes go on and off effortlessly. Please note: fittings install on standard lace holes only. Zero-Friction Fittings were designed specifically for use with iBungee and Race-Runners.