Maxproof flowlock Launch

The founding pre-sale is live  ·  Ships August 25  ·  First run only
MaxProof FlowLock™ · Founding pre-sale

We rebuilt leakproof underwear from scratch.

Most pairs get four things wrong. We fixed all four — thin, quiet, and finally dry at the sides.

 Over 5,000 five-star reviews · Trusted by 200,000+ women

1 Pair
$29
Try it
Most popular
3-Pack
$59
$19.67/pair
Best value
6-Pack
$89
$14.83/pair
Size Size guide
XS
S
M
L
XL
2XL
3XL
4XL
5XL
6XL
True to size. If you're between sizes, order one size up. Not sure? Your 100-day promise covers fit — if it's not right, we'll make it right.
Reserve my 3-Pack — $59 →
Please choose your size first.
Founding price · Ships Aug 25 · Free shipping
✓ 100-day promise✓ Reusable & washable✓ 200,000+ women
MaxProof FlowLock leakproof brief in black
100+

Copied by more than 100 companies. So we built the one thing they can't.

Since 2019, hundreds of thousands of women trusted us — and then the knockoffs came, copying our designs, our photos, even our website. We couldn't out-spend them in court, so we did the one thing a copycat can't screenshot: we rebuilt our underwear from the ground up, with the women who actually wear it. This is that pair.

Why it's different

In one look.

Every "leakproof" pair fails the same four ways. Here's what we changed.

The build

Made to actually hold up.

Reusable, washable, and built with the kind of construction the $8 knockoffs skip.

Close-up of the sealed core seam Macro of the RapidDraw perforated mesh Leg-opening edge and side-panel detail
See it for yourself

Watch it work.

100-Day Promise badge
The risk is ours

Wear it for 100 days.

If it's not the best pair you've ever owned, every dollar back — no fuss. After years of watching knockoffs leak and fall apart, we'd rather earn you than trick you. 200,000+ women and over 5,000 five-star reviews, since 2019.

Founding run · Ships Aug 25

Not the cheapest.
The pair the copycats can't touch.

Founding price and the first run only. When it sells out, the next batch is weeks away.

Get yours before it sells out →
Questions

Good to know.

When does it ship?

This is a founding pre-sale — orders ship August 25. You lock in the founding price now, before the first run sells out.

Is it actually thin and quiet?

Yes. It's built to disappear under anything — no bulk, no crinkle. Quiet was one of the hardest things to solve, and it's the thing we're proudest of.

How does it stop side leaks?

Most pairs armor the middle and quit at the leg openings — where leaks actually travel. We extended real coverage to the sides so you stay dry where other pairs fail.

Is it reusable?

Completely. Wash it and wear it again — no throwing money in the trash every week like disposable pads.

What if I don't love it?

Wear it for 100 days. If it's not the best pair you've ever owned, every dollar back. The risk is ours.

DesignComfort
Shop · FAQ · Contact

Family-owned in Texas · Designed with 200,000+ real women.