The Bikini Period. in SportyStretch™ For Heavy Flows

This style runs true to size. Order your most standard size. 

You can see our size chart here.

Our Fabrics

Main: PeriodTech™ 95% Nylon with 5% Spandex Knit

Lining: 95% Organic Cotton with 5% Spandex Jersey

Absorbent Layer: 88% Polyester with 12% Nylon 

Leak Resistant Layer: 100% Polyester PUL

How to take care of your Period.

Rinse any fresh blood off in the sink or the shower.

Hang to dry then add to your laundry pile. 

Machine wash warm, no bleach.

Tumble dry low. Do not dry clean or iron. 

Each pair of Period. underwear can hold up to 10 tbls, or 8-10 tampons, worth of blood.

Check out our absorbency test video 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 Cheetah: Hi! You know me. You know how much I love to run. Running is the best thing in the universe. The only that ruins it is when you run past a decomposing tampon or pad. Man, that sucks. There are some things you can't unsee and that's one of them. But not for much longer! With incredible people like you, we're going to end all this ridiculous waste and make my runs fantastic again. Kudos.