Trunk

Love them or they're free Limited Edition
$33 $28.05

Low as $26.40

Shorter Leg
Anti-Chafe
Soft Bamboo Viscose
Anti-Sweat
Trunk - Neon Strikes - Bamboo Underwear
Trunk - Neon Strikes - Bamboo Underwear
Trunk - Neon Strikes - Bamboo Underwear
Trunk - Neon Strikes - Bamboo Underwear
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Trunk

Love them or they're free Limited Edition
$33 $28.05

Low as $26.40

Shorter Leg
Anti-Chafe
Soft Bamboo Viscose
Anti-Sweat
Trunk - Black Currants Trunk - Scorpions Trunk - Ahoy Sailor Trunk - Smoking Gun Trunk - Smashed Avo Trunk - Juicy Plums Trunk - Butter Nuts Trunk - Snowballs Trunk - Dark Grey Trunk - Dark Navy Trunk - Deep Purple Trunk - Dark Green Trunk - Vivid Blue Trunk - Lyons Blue Trunk - Black Mambas Trunk - Winter Berry Trunk - Snow Worries Trunk - Neon Strikes Trunk - Hyper Glow Trunk - Melange Dusty Canyon Trunk - Melange Slate Grey Trunk - True Maroon Trunk - Yacht Rock Vol. 3

1. Select your fit

Boxer 6" Inseam Trunk 4" Inseam Front Fly 6" Inseam Sport 8" Inseam

2. Select your size

3. Select your quantity

4. Select your colours

Black Currants
Scorpions
Ahoy Sailor
Smoking Gun
Smashed Avo
Juicy Plums
Butter Nuts
Snowballs
Dark Grey
Dark Navy
Deep Purple
Dark Green
Vivid Blue
Lyons Blue
Black Mambas
Winter Berry
Snow Worries
Neon Strikes
Hyper Glow
Melange Dusty Canyon
Melange Slate Grey
True Maroon
Yacht Rock Vol. 3
Crew / Ankle / No-Show Socks

Crew / Ankle / No-Show Socks

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

Introducing Neon Strikes - Where Bold Meets Comfort

Make a statement with our limited-edition Neon Strikes colorway, featuring an electrifying combination of deep purple and vibrant hot pink accents that bring serious energy to your everyday essentials. This eye-catching design isn't just about looking good—it's engineered for all-day comfort and performance.

Why You'll Love Them:

Our trunk is specifically designed for shorter guys or those with slimmer legs, featuring a 4-inch inseam that provides the perfect proportions for your build. With a streamlined design, you get a smooth, minimalist fit that eliminates bulk and provides unrestricted comfort from morning to night.

Our innovative 3D Comfort Pouch features hidden elastic architecture that contours naturally to your body, keeping everything perfectly supported without compression or adjustment throughout the day.

Say goodbye to the dreaded ride-up and chafing. Our UltraGlyde™ panels are strategically placed along the inner thighs to ensure your trunks stay exactly where they should, whether you're at your desk, at the gym, or on the move.

Sustainable Luxury:

Crafted from super soft bamboo viscose (95% bamboo viscose, 5% spandex), these trunks feel incredible against your skin while actively wicking away moisture to keep you cool and dry. Plus, they're produced using an eco-friendly closed-loop system, so you can feel good about your choice.

Risk-Free Confidence:

Try them with our First Pair Guarantee—if you don't absolutely love them, they're FREE. Mix and match sizes, colors, or styles to create your perfect multi-pack.

Limited edition Neon Strikes colorway—grab yours before they're gone.

Our Trunk range is made from 95% viscose made from bamboo and 5% spandex. This equals an extremely soft and durable pair of underwear that wicks sweat brilliantly. The sizing is considered "fitted", meaning that if you are in between sizes, we would recommend sizing up.

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.

We Science'd Underwear

We didn't just make underwear. We reinvented it.

Ultraglyde™ Panels

Friction-resistant panels prevents chafing and ride-up, ensuring all-day comfort for your thighs. No more adjusting.

3D Comfort Pouch

Anatomically designed pouch keeps everything separated and supported, reducing friction and sweating.

Sweat Wicking

Advanced sweat-wicking tech keeps you dry and comfortable, even during the hottest days or toughest workouts.

Greg Taylor - CEO & Founder
Greg Taylor - CEO & Founder
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
Boxer Brief

Boxer Brief

  • 6 inch in-seam
  • Anti-chafe Ultraglyde panels
  • Bamboo viscose fabric
  • Suits thicker legs
  • 3D comfort pouch
Shop Boxer Brief
Trunk

Trunk

  • 4 inch in-seam
  • Anti-chafe Ultraglyde panels
  • Bamboo viscose fabric
  • Suits thinner legs
  • Good for shorter guys
Shop Trunk
Boxer Brief Fly

Boxer Brief Fly

  • 6 inch in-seam
  • Anti-chafe Ultraglyde panels
  • Bamboo viscose fabric
  • Easy access front fly
  • 3D comfort pouch
Shop Boxer Brief Fly
Boxer Brief Sport

Boxer Brief Sport

  • 8 inch in-seam
  • Anti-chafe Ultraglyde panels
  • Bamboo viscose fabric
  • Longer for activity
  • 3D Comfort Pouch
Shop Boxer Brief Sport
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.
The Ultraglyde™ panels are friction-resistant panels on the inner thighs that prevent chafing and stop the legs from riding up. They ensure your legs glide past each other rather than rubbing.
Our 3D Comfort Pouch is anatomically designed to keep everything separated and supported. It reduces skin-on-skin contact, friction, and sweating, giving you the support you need without feeling restricted.
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.