Women's Period Bikini Brief - Bamboo Underwear - Model:Armani
Women's Period Full Brief - Bamboo Underwear
Women's Period Bikini Brief - Bamboo Underwear - Model:Armani
Women's Period Bikini Brief - Bamboo Underwear - Model:Armani
Women's Period Bikini Brief - Bamboo Underwear - Model:Armani
Women's Period Bikini Brief - Bamboo Underwear - Model:Armani
Women's Period Bikini Brief - Bamboo Underwear - Model:Chloe
Women's Period Bikini Brief - Bamboo Underwear - Model:Chloe
Women's Period Bikini Brief - Bamboo Underwear - Model:Chloe
Women's Period Bikini Brief - Bamboo Underwear - Model:Chloe

Period Bikini Brief

$29.70/pair $118.80 for 4 pairs Save 10%

Leak-proof bamboo underwear with an ultra-slim absorbent core.

4.3 (20)

Absorbency

Size

Colour Black

1
  • Free shipping
  • 30-day First Pair Guarantee
  • Anti-Bulk Tech an ultra-slim absorbent core that never feels like a pad.
  • 12-hour protection moisture-wicking top layer, leak-proof base.
  • Hypoallergenic bamboo soft on sensitive skin, naturally anti-odour.
Product Description

The Period Bikini Brief is your everyday go-to. Slim, supportive, and designed to look and feel like our best-selling Bikini Briefs, this style absorbs without adding bulk. From desk days to weekend plans, it’s breathable, soft on skin, and engineered for real-life performance.

  • Integrated absorbent core
  • Mid-rise with classic bikini silhouette
  • Soft FSC-certified bamboo viscose
  • Moisture-wicking and odour-resistant
  • Tested for comfort, durability, and long wear
Fit & Fabric
Main fabric: 95% viscose (bamboo), 5% elastane Inside gusset layer: 100% merino wool Absorbent layer: 70% polyester, 30% cotton with TPU laminate If you usually wear a Small in our SmoothFit line, we suggest selecting a Medium in the Period Underwear. The fabric is less stretchy due to its absorbent construction, so a larger size may offer a more comfortable fit. However, if you prefer a snugger feel, your usual size will still work.
Shipping

We aim to dispatch your order 1-2 business days after placing your order.

Free shipping, no minimum spend.

GENERAL SHIPPING TIMES:

NSW, VIC & QLD = approx. 1-3 business days after dispatch.

WA, NT, TAS = approx. 2-4 business days after dispatch.

We offer international shipping to selected countries, which is shown at checkout. International shipping may vary based on local fulfilment.

30 Day First Pair Guarantee

We are so confident you'll love your Step Ones, we'll give you a FULL REFUND on your FIRST PAIR if you don't like them for whatever reason.

Which period style is right for me?

All with the same leak-proof core and bamboo softness. Pick the coverage and absorbency that suit your flow.

Period Thong

Light absorbencyFrom $33

Up to 1 tampon. Minimal coverage.

Shop Period Thong
Period Bikini Brief

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Period Bikini Brief

Moderate or heavyFrom $33

Up to 3 tampons. Moderate coverage.

Comfort First

At Step One, we make products inspired by real life, embracing the ethos of Comfort First. We believe protection is about freedom and being present.

  1. Same Thickness

    Our revolutionary technology keeps the same ultra-thin profile across all absorbency levels.

  2. Max Absorbency

    Engineered to handle heavy flows without the bulk of traditional pads or thick underwear.

  3. Anti-Leak

    Multi-layered protection that locks in moisture and prevents leaks, all day and night.

  4. Soft & Breathable

    Made from breathable and soft bamboo viscose. Naturally hypoallergenic and anti-bacterial.

26M+ Pairs Sold

65K+ 5-Star Reviews

2M+ Happy Customers

The traditional approach* is bulky.

Zero bulk, all protection. The same comfort from light to heavy days.

Feature Other Brands*Step One™
Same thickness for all absorbency levels
Ultra-thin, invisible under leggings
Quick-dry technology
Stays dry and comfortable

*Traditional brands increase the thickness of the absorbent layer as capacity goes up — bulky, visible under clothing, slow to dry and damp-feeling. Our patented technology keeps a consistent, ultra-thin profile regardless of absorbency level.

Community

Real people, real flow.

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30-day First Pair Guarantee

Love them or they're free. If you don't love your first pair, we'll give you a full refund.

Shop Step OneLearn more

Frequently Asked Questions

How does the Anti-Bulk technology work?

Our absorbent core is engineered to be ultra-slim rather than ultra-thick. We use high-performance technical fabrics that are highly absorbent without the bulk of traditional pads or thick underwear.

Can I wear these all day?

Yes! Our heavy absorbency pairs are designed for up to 12 hours of wear, depending on your flow. The quick-dry top layer ensures you stay feeling dry and fresh throughout the day.

How do I wash my period underwear?

It's simple: rinse in cold water until the water runs clear, then toss them in a cold machine wash (no fabric softener!). Hang to dry.

What if I'm between sizes?

We recommend sizing up if you're between sizes for maximum comfort during your cycle. Our fabrics have 4-way stretch to move with your body as it changes throughout the month.

How does the 30 Day First Pair Guarantee work?

We are so confident you'll love your Step Ones, we'll give you a FULL REFUND on your FIRST PAIR if you don't like them for whatever reason.