There’s actually a really touching story behind them, too.
Thinx period underwear was supposed to be 'non-toxic'. Now customers feel betrayed, Menstruation
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Why does underwear get stinky? Is it only due to sweat? I use perfume, but my underwear still gets smelly. - Quora
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TOOTLES-Womens Fart Filtering Charcoal Underwear-Flatulence Neutralizing-Deodorizing & Blocking-High Waist Hip Hugger Panties (Medium), Black : : Fashion
Sniff test: Do Shreddies fart-filtering underwear actually work?
Fart Proof Underwear - Shreddies Australia & New Zealand