When installing your Race Laces we recommend doing this while your foot is in the trainers or shoes. You should initially have them quite loose and leave approximately 2-3″ or 5-7.5cm on the end before cutting off the excess.The reason for this is so that you can adjust them after installation. You can tighten or loosen your elastic shoe laces in the same way that you would with “normal” shoelaces.When the laces are as tight or as loose as you desire simply lock off the clamp and re-attach the cord clamp.If you still aren’t sure just ping me an email: hello@theracelace.com