No-Tie Shoelaces "Caterpy," no-tie, no-untie shoelaces, are products developed for sports scenes, mainly running, and comfortable lifestyles. By attaching Caterpy, which has knob-like bulges and the elasticity of rubber bands, any shoes will become shoelace-free. Once you wear them, experience the "ultimate fit" that you'll become addicted to. Two navy blue laces. I thought about using them, but I haven't had the opportunity, so they are unused.