If you have flat ironed or even applied magnetic rollers on your sisterlocks, you will notice the wavy look doesn't last very long and that is a true bummer.

If you want to make the wavy last a little longer, you just need to repin the locks in the direction it was originally.  Below is an example of what I mean (I only did one for an example, but you need to pin all your locks down). Hope this help you keep your super straight sisterlocks longer.

Layers Example Before Pined