Crafted with 100% organic cotton against your most delicate skin, our innovative underwear offers unmatched comfort and sustainability.

As the first of its kind on the market, our organic Heavy Flow G-String is perfect for those seeking a dependable, eco-friendly, and efficient solution for their menstrual needs. Say goodbye to the necessity of additional products like menstrual cups – our standalone design provides supreme effectiveness.

By hugging your body more closely, our G-String design delivers unexpected benefits compared to traditional bikini styles. It minimizes opportunity for transfer and eliminates fluid spreading over your bottom, ensuring a cleaner and more secure experience. Explore the innovative difference that only Flow Riders' organic period underwear can provide – thoughtfully designed with your utmost comfort and protection in mind.

Our Heavy Flow G-string is a protected design:
United States Design App. No. 29/956,463
European Des. Reg. No. 015070516-0001
New Zealand Design Reg. No. 432551

* Manufactured in New Zealand from Australian and American made fabrics.

We use three types of fabric:

Organic Cotton Jersey Stretch, 90% Organic Cotton, 10% Spandex, Made in Australia

Organic Cotton Absorbent Layer, 100% Organic Cotton, with SILVADUR™ Antimicrobial Technology, Made in USA

Organic Cotton PUL Waterproof Layer,  65% organic cotton, 30% polyurethane, 5% lycra, with SILVADUR™ Antimicrobial Technology, Made in USA

100% Free of PFOS, PFOA, lead, dioxins, heavy metals & BPA; Free from phthalates: contains no DEHP, DBP, BBP, DINP, DIDP and DnOP. Read Blog Article

SILVADUR™ Antimicrobial to inhibit the growth of bacteria, fungi and algae on the fabric, control bad odors and provide intelligent freshness protection. SILVADUR® is proven to be safe against the skin. Tests of bamboo, cotton and polyester treated with 10 times the recommended amount of SILVADUR® found no skin irritation or sensitization after multiple exposures.

Our fabric is so absorbent that it can absorb ten times its weight in two seconds.

Engineered to meet exacting USA requirements, this is the highest quality-assured organic fabric on the market.

Unique, three-dimensional engineered dimple pattern provides greater retention, superior hold, faster distribution of moisture and less leaking under compression.

CPSIA certified, meeting stringent standards by the U.S. Consumer Products Safety Commission on lead and phthalates and flammability.

Extremely breathable, soft, stretchy & durable

Very durable, tested to withstand 300+ washings.

100% eco-friendly.

To create the waterproof layer we use a unique process permanently melt-bonding our specially-treated TPU film to the fabric without toxic solvents. The process emits no toxic waste or VOCs that are harmful to the environment.

The fabric is manufactured with no harmful chemicals or finishes in controlled conditions in American textile mills.

To properly care for and prolong the life of your organic period underwear, follow these simple washing instructions:

Rinse: After use, rinse the underwear in cold water until the water runs clear. This helps remove any excess blood before washing. If you are not ready to wash them immediately, hang them some where in the meantime; over a faucet works well.

Wash: Hand wash the underwear using a mild detergent in cold water, or place them in a laundry bag and machine wash on a gentle cycle with similar colors. Avoid using fabric softener or bleach.

Dry: Hang the underwear to air dry, preferably in direct sunlight. You can dry them in a dryer on a low heat. Always ensure your underwear are completely dry before putting them away.

Stain removal: If you rinse them well immediately, there should not be any staining. If staining does occur, you can use a gentle stain remover or create a baking soda paste (mix baking soda with water) and gently rub it onto the affected area before washing.

Storage: Store your clean and dry period underwear in a clean, dry place, away from direct sunlight.

*Avoid soaking as this may break down the natural fibers*

By following these washing instructions, you'll ensure your period underwear stays in optimal condition, providing you with reliable and long-lasting protection. 

It is Important you get the best fit to experience the highest level of comfort possible.

We strongly recommend that you take a waist measurement and match it to your size in the size chart.

How to take your waist measurement:

Prepare the measuring tool: Get a flexible measuring tape, which can be found at most sewing or fabric stores or ordered online.

Locate your waist: Stand upright and find the natural crease of your waist by bending to the side. It's usually the smallest part of your torso, above the belly button, and below the ribcage.

Take the measurement: Wrap the measuring tape around your waist at the level of your natural crease. Ensure that the tape is snug but not too tight, and that it's parallel to the floor all the way around.

Read the measurement: Look at the point where the measuring tape overlaps itself, and take note of the number. This is your waist measurement.

If you don't have a flexible measuring tape, you can use a piece of string or cord, mark the spot where it overlaps, and then measure the length using a flat ruler.