Period Underwear 101: Your Everyday Superpower
What it actually is, how it works, how to wash it, and how to pick the right hold level — no jargon, just the plain-English basics.
If you've never tried period underwear, the whole idea can sound a little mysterious. How does fabric actually hold liquid? Won't it feel wet? Is it really as reliable as what you're already using?
Fair questions — so let's start from zero. This is the 101 version: what it is, how it works, how to take care of it, and how to figure out which hold level is right for your flow.
How It Actually Works
Layer One: Wicking
The layer against your skin pulls moisture away immediately, so it never sits wet against you the way a pad can.
Layer Two: Absorbing
A dense inner core locks liquid into place — this is what actually holds your flow, and it's what determines the hold level of a given style.
Layer Three: Barrier
A leak-resistant outer layer stops anything from soaking through to your clothes — this is your backup, not your first line of defense.
Comes in Hold Levels
Moderate, heavy, and super hold styles all use the same three-layer system — they just vary the thickness of the absorbent core to match your flow.
Which Hold Level Is Right for You
| Your Day | Hold Level | Try |
|---|---|---|
| Light days, spotting | Moderate hold | Lace Trim Bikini |
| Regular flow days | Heavy hold | Bamboo Leakproof Brief |
| Heavy days, overnight | Super hold | Leakproof Boyshorts |
| As backup with a cup or tampon | Any hold level | Shop All Leakproof |
Start Here
If you're trying period underwear for the first time, this is the one to start with — heavy hold, everyday comfort, and a fabric that doesn't feel like "period gear."
- Heavy hold, up to 12 hours
- Breathable bamboo fabric
- Machine washable
I wish someone had explained period underwear to me this plainly the first time I tried it — no marketing buzzwords, just how it works and how to pick the right one.
Once you get the hold level right for your flow, it stops feeling like a "period product" and starts feeling like just... underwear. That's the goal.
20% off leakproof styles, this week only
Find Your Hold Level
20% off leakproof styles plus new arrivals — start with heavy hold if you're not sure.
Shop Leakproof Panties →Free shipping on orders $85+ · Size chart →
Period Underwear Questions
Period underwear is underwear built with absorbent, leak-resistant layers sewn directly into the fabric, so it works on its own or as backup — no separate pad or tampon required, depending on your flow.
It uses a multi-layer construction: a moisture-wicking layer against your skin, an absorbent core that locks in liquid, and a leak-resistant outer layer — so fluid gets pulled away from your skin and held in place instead of soaking through.
Rinse in cold water first, then machine wash cold with like colors and skip the fabric softener, which can clog the absorbent layers over time. Air dry or tumble dry on low — check the care label for your specific style.
It depends on your flow and the hold level — moderate hold styles are typically good for 4-6 hours, while heavy and super hold styles can go longer. As a general hygiene guideline, change at least every 8-12 hours regardless of hold level.
For light-to-moderate flow days, most people find it works just as well on its own. For heavier days, many use it as backup alongside a cup or tampon for extra confidence — it's less about replacing everything and more about having the right layer for the day.
Regular leakproof underwear isn't designed for swimming — the absorbent layers work differently in water. Look specifically for swim-labeled period products if that's what you need.
