Women's Bikini Brief - Celtic Baddies - Bamboo Underwear
Women's Bikini Brief - Celtic Baddies - Bamboo Underwear
Women's Bikini Brief - Celtic Baddies - Bamboo Underwear
Women's Bikini Brief - Celtic Baddies - Bamboo Underwear
Women's Bikini Brief - Celtic Baddies - Bamboo Underwear
1 / 5
Moderate coverage
Sweat Wicking
Bamboo Viscose
Hyperallogenic
Limited Edition
Tap Shoe
Ahoy Sailor
Butter Scotch
Ice Melt
SLSA x Step One
STEPtember
Euro Streakers
Virgo
Spellbinders
Sagittarius
25 Stay Alive
Mystery 4 Pack
Mistle Toes
Frost Bites
Starlight
Lucky Pinks
Celtic Baddies
Eurekas
Commandos

Bikini Brief

$25 $22.50

Low as $20

Select Quantity

Select Size

Crew / Ankle / No-Show Socks

Crew / Ankle / No-Show Socks

7
Free Shipping
30-Day Guarantee
Over 65k 5-Star Reviews

Shamrock your top drawer with our limited-edition St Patrick’s Day collection. This playful festive print celebrates luck, laughter, and a little bit of mischief—perfect for channeling all the good vibes of Paddy’s Day, from sunrise coffees to last-round cheers.

Why You’ll Love Them

Made with certified FSC organic bamboo fabric, these bikini briefs deliver eco-friendly luxury that feels as good as it looks. The naturally hypoallergenic bamboo is gentle on sensitive skin, while moisture-wicking technology keeps you feeling fresh and dry whether you’re at work, at the pub, or on the couch.

The irresistibly soft waistband sits comfortably without digging in—so comfy you’ll forget you’re even wearing them. The lightweight, flexible fabric moves with you through every jig, brunch, and Netflix binge.

Premium Features

  • FSC-certified organic bamboo fabric

  • Naturally hypoallergenic and breathable

  • Moisture-wicking for all-day freshness

  • Ultra-soft, no-dig waistband

  • Lightweight and flexible for ease of movement

  • Durable construction built to last

  • Limited edition St Patrick’s Day release

These Baddies are available for a limited time only. Treat yourself to a little extra luck—or share the gift of comfort and good fortune with someone special this Paddy’s Day.

Moderate coverage with balanced comfort. The seamfree design ensures a smooth, invisible fit under any clothing.

Fabric: 79% bamboo viscose, 15% polyamide, 6% spandex blend. Buttery soft texture with flexibility.

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.

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.

Comfort Reimagined

Underwear so comfortable, you'll forget you're wearing it.

Seamless Design

Our SmoothFit™ technology provides a completely seamless finish, meaning no visible lines and no digging in.

All Day Comfort

Designed for everyday wear, providing a soft touch against your skin while staying perfectly in place.

Hypoallergenic

Naturally hypoallergenic bamboo viscose is gentle on sensitive skin and prevents irritation.

Reimagined
26M+
Pairs Sold
65K+
5-Star Reviews
2M+
Happy Customers
Trustpilot

Trust Score 4.5/5

Real Results from Real Customers

Which Step Ones are right for me?

Compare our styles to find your perfect fit.

Best Seller
SmoothFit Thong

SmoothFit Thong

  • Minimal cheeky coverage
  • Seamfree construction
  • 79% Bamboo Viscose
  • No Visible Panty Line (VPL)
  • Moisture-wicking fabric
Shop SmoothFit Thong
SmoothFit Full Brief

SmoothFit Full Brief

  • Full coverage & security
  • Seamless waistband
  • 79% Bamboo Viscose
  • Gentle on sensitive skin
  • Eco-friendly resource
Shop SmoothFit Full Brief
SmoothFit Boyleg

SmoothFit Boyleg

  • Extended boyleg cut
  • No ride-up design
  • 73% Bamboo Viscose
  • High-waist support
  • Ultra-stretchy fit
Shop SmoothFit Boyleg
SmoothFit Bikini Brief

SmoothFit Bikini Brief

  • Moderate coverage
  • Seamfree invisible fit
  • 79% Bamboo Viscose
  • Buttery soft texture
  • Hypoallergenic fabric
Shop SmoothFit Bikini Brief
Classic Bikini Brief

Classic Bikini Brief

  • Classic versatile fit
  • Soft molded waistband
  • FSC-certified Bamboo
  • Fun prints & colors
  • Sizes up to 5XL
Shop Classic Bikini Brief
Body Shorts

Body Shorts

  • Extended leg coverage
  • No-ride-up leg design
  • 95% Bamboo Viscose
  • Anti-chafe panels
  • Inclusive XS-4XL sizing
Shop Body Shorts
30 Days

First Pair Guarantee

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

Risk-free trial
Full refund

Frequently Asked Questions

They are made from high-quality, organically grown Bamboo Viscose. This material is incredibly soft, breathable, and moisture-wicking, keeping you cool and dry all day long.
Our SmoothFit™ technology ensures a seamless finish that doesn't dig in or leave visible lines under clothing. It's designed to stay in place while providing ultimate comfort.
Yes! Bamboo viscose is naturally hypoallergenic and gentle on sensitive skin, making it perfect for all-day wear without irritation.
We are so confident you'll love your first pair of Step One underwear that if you don't, you can keep them and we'll give you a full refund. No questions asked. This applies to your first single pair purchase.
Machine wash cold with like colors. Tumble dry low or line dry in the shade. Do not bleach, iron, or dry clean to maintain the quality of the bamboo fabric.