This style runs true to size. Order your most standard size.
You can see our size chart here.
Main: PeriodTech™ 85% Nylon with 15% Spandex Knit
Lining: 95% Organic Cotton with 5% Spandex Jersey
Absorbent Layer: 100% Polyester
Leak Proof Layer: 100% Polyester PUL
Our fabrics have been rigorously tested by a third-party company to ensure we are compliant with industry standards and best practices. We are proud to use fabric that is free of PFAS toxins. You can read more about product safety here.
How to take care of your Period.
Rinse for a few seconds.
Either hand wash and hang dry, or add to the laundry pile.
Regular wash, no bleach.
Tumble dry low or hang dry.
Do not dry clean.
Each pair of Period. underwear can hold up to 2 tampons worth of blood.
Check out our absorbency test video here.
You can see the length of the absorbent panel here.
How long will one pair of Period. last?
Everybody periods differently so it’s tough to be exact. Our average time is about 8 hours on a heavier flow day. Though some customers need to change after 3 to 4 hours, and others can go up to 14 hours (lucky them!). As your period gets lighter, one pair can take you through the day and night (just like regular underwear). But again, everybody Periods differently, so you need to take one cycle to figure out exactly how often you need to change. Start with a conservative estimate on your heavy days, and check in on your Period underwear after 4 hours. If you still feel good, give it another hour. Keep going until you figure out your limit. Here at Period, we find we need between 3 to 4 pairs on the first two heavy days, including evenings. And if you leak, please forgive us! Just this once. (Remember how many tampons you have forgiven). Treat the ‘leak’ as a gift and note the hour of your leakage. That is the best indicator of your ‘flow threshold’ how long the underwear will last for you.
Message from a blade of grass: Hi! You might notice me. I am one of a trillion trillion blades of grass. But I notice you. With just one pair of Period underwear, you're saving the Earth from so much non-disposable junk. I have some blade of grass friends who live near landfills and let me tell you, slow decomposing tampons and pads are not pretty. Next time you see a breeze going through a field of grass, know that it's us waving hello and thank you at you.