Your soon-to-be favorite bikini underwear can now do a marathon, a spin class, a barre class, you name it! currently the world champion in being waste-free and super-absorbent. The Sporty Bikini is made from The Period Company's PeriodTech™ fabric - a super stretchy Nylon and Spandex knit that moves with you. As always, the gusset is made with organic cotton.