As someone who has been on the hunt for period underpants that work consistently and are worth the high ticket price (that they often are), I can hands down say that Kayaness is it. And I've tried them ALL (Thinx, Knix, Saalt, Aerie, Aisle, The Period Company, the list goes on).
Over a year ago, I bought both the brief and boyshorts from Kayaness to test out, and I instantly thought these were a game-changer. A few things stood out to me — [1] the gusset was actually a reasonable size, so plus-size baddies, you don't have to worry about side leakage with the brands that don't consider adjusting the gusset for their larger sizes. And [2] the panel goes higher up the front, so front bleeders and stomach sleepers alike can breathe easy without fear of an embarrassing moment.
Now, I've been duped before and gotten overly excited about a new period panty option early on that turned out to be a bust after a few washes/wears (hello Saalt :/), so I was holding off on judgment until I put Kayaness to the test. And after a year of relying on my Kayaness panties during the heaviest days/days that I couldn't emotionally handle dealing with less superior period underpants, I can confidently say that these are worth it. I threw everything else away and replaced my entire period panty collection with Kayaness. These are hands down the best; the quality is so high, and with an entire year of wearing them, I can say that they are just as effective as when I first got them. The panties themselves look great! Now, they may be a bit of a no-frills option, but they do the job. Just a high-quality product that helps me feel good, confident, and secure during a period of time that I just don't need to be messing with an inferior period panty.
I promise you, you will not be disappointed if you try these out. Kayaness is the best on the market for period panties, and more people should know that these are the best.