The Adaptive Bikini
The Adaptive Bikini
The Adaptive Bikini
The Adaptive Bikini
The Adaptive Bikini
The Adaptive Bikini
The Adaptive Bikini
The Adaptive Bikini
The Adaptive Bikini
The Adaptive Bikini
The Adaptive Bikini

The Adaptive Bikini

Regular price $12.00

Heavy absorbency: designed for heavy days and optimum accessibility. 

Absorbs up to 9 tampons of flow and 5 pads. 

Hi! I’m a classic mid-rise with super powers. I have easy-to-grasp velcro loops that make it super easy for people who period to get in and out of me. I make getting in and out of me a breeze. I also make heavy days a breeze. I have a four-layer towel system that can handle your period flow for hours and, with a wicking layer, can super absorb, so that you never experience any wetness. On top of all these super powers, I’m also made of super soft organic cotton. 

When to wear: on heavy days, mid-days, and any day, if you love more accessible underwear.

 This style runs small - order up a size!

Buy 4, get free shipping! Free domestic shipping over $48!

We designed this style with the utmost comfort in mind; however, if the garment fits too snugly on the body the adjustable closures will struggle to remain closed. Due to the nature of the adjustable closures, we highly recommend sizing up a complete size.

You can see our size chart here.

Our Fabrics

Body: 90% Nylon Brushed Microfiber with 10% Spandex Jersey

Absorbent Layer: 100% Polyester  

Leak Proof Layer: 100% Polyester PUL


None, zero, nada, zilch. We are proud to be one of the few period underwear brands that do not use any toxins in our products because who wants chemicals near the most sensitive part of their body? Not us. Or you.

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 10 tbls, or 8-10 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.

Personal message from soil: I know it’s highly unusual to get a message from soil but in this case, I just had to say thank you. Just by using one pair of Period underwear, you’re saving the natural world from 9 tampons or 4 pads being thrown away and (because they don’t biodegrade) polluting the Earth for generations. From me and all my microbes - thank you. 

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