Trunk

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

Anti-chafe bamboo trunks. 4" inseam.

Size

Print Neon Strikes

1
  • Free shipping
  • 30-day First Pair Guarantee
  • 3D Comfort Pouch hidden elastic keeps everything supported, all day
  • UltraGlyde™ anti-chafe panels legs stay put, no ride-up
  • Organically grown bamboo viscose soft, breathable and moisture-wicking
  • 30-day First Pair Guarantee love them or they're free
Description

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.

Fit & Fabric
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.
Shipping

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

Free shipping, no minimum spend.

NSW, VIC & QLD: approx. 1-3 business days after dispatch. WA, NT, TAS: approx. 2-4 business days after dispatch.

Returns & 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, within 30 days.

Unworn items in original packaging can be returned or exchanged within 30 days of delivery.

We Science'd Underwear

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

  1. Ultraglyde™ Panels

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

  2. 3D Comfort Pouch

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

  3. 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

7,550 5-Star Reviews

2M+ Happy Customers

Real Results from Real Customers

What customers say about our Trunks.

Rated 4.7 out of 54.7 from 8,718 reviews of this product

Which Step Ones are right for me?

All made from bamboo viscose with anti-chafe Ultraglyde panels. Pick the length and fit that suits you.

Best seller

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6″ inseam, from $33

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Trunk

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Trunk

4″ inseam, from $33

Suits thinner legs. Good for shorter guys.

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.

Frequently Asked Questions

What are Step One Trunks made of?

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.

How does the Ultraglyde™ panel work?

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.

What is the 3D Comfort Pouch?

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.

How does the First Pair Guarantee work?

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.

How should I wash them?

Machine wash cold with like colours. Tumble dry low or line dry in the shade. Do not bleach, iron, or dry clean to maintain the quality of the bamboo fabric.