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Join the period revolution and invest in period underwear from Thinx. Whether you're overspending on tampons and pads, you're looking for a more sustainable option or you're after a comfortable solution to the time of the month – Thinx underwear has gotchu. Thinx period panties serve up a range of absorbancies for different flows and a big ol' selection of designs. Find reusable period panties in bikini cuts, full briefs and even PJ shorts for protection at night. Prayers: answered. Switch up your underwear drawer and pick up some period-proof underwear.