SoftFit Thong

Shale / XXS

$22.40 USD $28.00 USD

SoftFit Thong

Prebiotic Undies

SoftFit Thong

$22.40 USD $28.00 USD

Extra 20% off with code: BIGFUN20

20% off for Early Adopters

Good bacteria grow here. This (not leakproof) underwear is lined with ProBioma™, our prebiotic technology designed to help good bacteria (Lactobacillus) thrive, right in your underwear.

Underwear for every day , not leakproof or period underwear
Tested to reduce odor by up to 91%
Certified Microbiome-Friendly (we're pro-microbial not anti-microbial)
Ultra-soft TENCEL™ blend featuring a no-dig waistband
95% organic cotton gusset

If you agree with any of these statements, prebiotic undies are for you!

You want to be proactive about vulva health
You prefer natural fibers
You’re concerned about vaginal odor
You're sexually active
You're physically active
You’re concerned about pH balance

ColorShale

SoftFit Thong Size Guide

Low rise, so we recommend sizing by your hip measurement. Standing with your feet together, wrap a soft measuring tape around the widest part of your hip parallel to the floor.

SoftFit sizes 2X–5X run small compared with our other styles so please use the SoftFit size chart rather than your usual Aisle size.

Size	Hip	Waist
XXS	30-33"	21-23"
XS	33-35"	23-25"
S	35-37"	25-27"
M	37-39"	27-29"
L	39-41"	30-31"
XL	41-43"	31-33"
2X	42-46"	34-38"
3X	46-50"	38-42"
4X	50-54"	42-46"
5X	54-58"	46-50"

Shipping & Returns

Shipping

US & Canada

Order value	Cost	Delivery
Over $99	$2.99	5–7 business days
Under $99	$9.99	7–10 business days
Any order (VIP)	$21.99	3–5 business days

International

Order value	Cost	Delivery
Over $200	$50	7–14 business days
$90–$199.99	$25	7–14 business days
Under $90	$15	7–14 business days

View full policy →

Returns

We accept returns of unopened, unworn, non-sale underwear within 20 days of delivery for store credit. Due to the intimate nature of our products, we are unable to offer refunds.

At this time, we are unable to accommodate exchanges.

All products purchased on sale are final sale and not eligible for return.

View full policy →

FAQs

Our ProBioma™ prebiotic technology is undetectable in look, feel and smell.

Prebiotic: A plant-based polysaccharide. It’s food for the beneficial bacteria (Lactobacillus) that already live on your body, not live bacteria itself.

Delivery matrix: A patent-pending plant based biopolymer. Under a microscope it looks like a household sponge, and it holds the prebiotics in the fabric through washing.

What it doesn’t contain: No live bacteria, no zinc oxide, silver, or other metals.

Skin safety: Human skin patch tested and certified non-irritating.

Yes. ProBioma™ is made with biocompatible, bio-based materials and designed for continuous, everyday wear, just like regular underwear.

We know that ProBioma™ remains effective after 25 washes based on third party lab tests. 25 washes is industry standard and works out to about 6 months if you do laundry once a week.

Prebiotics are the "food" that feeds your existing good bacteria.

ProBioma™ actively reduces odour throughout the day from the time you start wearing it.

Body: 48% TENCEL™ Lyocell, 48% Organic Cotton, 4% LYCRA® Spandex

ProBioma™ lining: 95% Organic Cotton, 5% Spandex
Machine wash cold.
Dry on gentle or hang to dry.

Pro-microbial not Anti-microbial

Why Prebiotic Underwear?

Lactobacillus matters

Lactobacillus is a good bacteria that helps keep the vagina healthy.

Lactobacillus produces lactic acid, which keeps your pH balanced and makes it difficult for harmful bacteria to grow.

Harmful bacteria can cause odor and discomfort.

How ProBioma™ helps

ProBioma™ is a prebiotic technology that is designed to target and support the growth of lactobacillus in the lining of your underwear to reduce odor by up to 91% and create a microbiome-friendly environment.

ProBioma™ is like an all-inclusive resort for Lactobacillus in your undies.

Why You'll Love It

Pro-microbial, not anti-microbial

Anti-microbial underwear kills good and bad bacteria. ProBioma™ supports the growth of Lactobacillus (good bacteria) in your underwear making it harder for bad bacteria that can cause odor and discomfort to grow.

Made with organic cotton

Our prebiotic underwear are designed with a 95% organic cotton lining. Breathable natural fibers help limit the low oxygen conditions where less desirable bacteria thrive. ProBioma™ is Certified Microbiome-Friendly by MyMicrobiome.

No-Dig, comfortable design

So soft you’ll forget they’re on. Made with buttery TENCEL™ and organic cotton with an ultra slim woven elastic that won’t roll or dig. Plus a tagless label means less irritation on skin.

Wear Daily

Get the most out of ProBioma™ by wearing it every day, just like your (old 😉) regular underwear. Our underwear is tested for harmful substances (STANDARD 100 by OEKO-TEX®).

Microbiome-Friendly gusset MyMicrobiome™ Certified

Tested for harmful substances STANDARD 100 by OEKO-TEX®

Supports Lactobacillus growth on fabric ISO 20743 lab tested

Reduces Odor ISO 17299-3 lab tested

Remains effective after 25 washes (the industry standard) ISO 20743 lab tested

“I’m happy to see a product that supports the microbiome rather than working against it.”
— Emila Nevin RN

This product is not intended to diagnose, treat, cure, or prevent any disease. Consult a healthcare provider with questions about your individual health.

Antimicrobial Designed to kill or stop microbes, including bacteria. It doesn’t pick favorites, so good bacteria go too.

Lactobacillus A family of good bacteria that make lactic acid. In the vagina, they help keep things naturally acidic, which harmful bacteria don’t like.

Prebiotic Not to be confused with probiotics. Probiotics are live bacteria, and prebiotics are nutrients that help good bacteria grow.

Microbiome The community of tiny living things, like bacteria, that live in and on your body. Your gut, skin, and vagina each have their own.

Biocide A substance designed to kill or stop living organisms. Think antimicrobials, bleach, pesticides.