I’ve used Knix brand period underwear before. I really like them. On days when my period is heavy, I still wear a tampon with them. I’ve found them to be a good replacement for panty liners and an extra layer of support but I still feel like I need to wear a tampon. I just ordered some of the super leakproof (as opposed to the leakproof ones I have) so that may change my opinion on the tampon piece.