thinx (btwn) teen period underwear - bikini panties (blue, 11/12 - regular absorbency) thinx btwn for tweens and teens who are beginning their menstrual cycles, periods can be inconsistent and uncomfortable. thinx (btwn) was founded to help the next generation period easier, and makes period panties for teens. our menstrual underwear is specially designed to absorb their flow, keeping everything fresh and dry. made with our patented period-absorbing design, every pair of thinx (btwn) has leak protection built in the ultrathin gusset. the moisture-wicking layer draws away wetness and dries fast, while the odor-controlling layer neutralizes smells. the leak-resistant barrier keeps clothes, sheets, and everything else stain-free. thinx (btwn) teen period underwear comes in styles that hold up to 4 tampons’ worth of flow without feeling bulky. our period panties for teens are the perfect solution for heavy or light flow. on light days, our undies can be worn instead of other femcare products like sanitary pads and pantyliners. on heavy days, our underwear can be worn as a backup to other menstrual hygiene products for extra protection. thinx (btwn) are machine washable, reusable, and simple to care for—just don’t use fabric softener, bleach, or iron. a more sustainable and eco-friendly period product than single-use disposables, these girls period panties can be used every month. thinx (btwn) is made by thinx inc., who make period underwear for women, girls, and all people with periods. we recommend beginning with our teen starter period kit. shop more products by clicking our logo.