Trunk - Hyper Glow - Bamboo Underwear
Trunk - Hyper Glow - Bamboo Underwear
Trunk - Hyper Glow - Bamboo Underwear
Trunk - Hyper Glow - Bamboo Underwear

Trunk

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

Anti-chafe bamboo trunks. 4" inseam.

4.7 (8,718)

Size

Print Hyper Glow

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

Hyper Glow Trunk - Men's Underwear

Energize your essentials with the Hyper Glow Trunk. This bold black and pink colorway brings high-energy style to your underwear drawer while delivering the premium comfort Step One is known for. The 4-inch inseam provides a sleeker fit, perfect for guys with thinner legs.

Premium Comfort Features:

  • First Pair Guarantee - Love them or they're FREE
  • 4-Inch Inseam - Sleeker cut perfect for guys with thinner legs
  • 3D Comfort Pouch - Hidden elastic technology surrounds you perfectly and keeps everything securely in place all day
  • UltraGlyde™ Anti-Ride Technology - Specially designed panels prevent annoying leg ride-up, so you stay comfortable from morning to night
  • Breathable Bamboo Viscose - Naturally moisture-wicking fabric keeps you cool and dry, produced sustainably in a closed-loop system
  • Premium Fabric Blend - 95% viscose made from bamboo, 5% spandex for the perfect stretch
  • Mix & Match Freedom - Combine any size, color, or style to create custom multi-packs

Hyper Glow Collection

Bold color meets unbeatable comfort. Because your underwear should match your energy.

 

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

Boxer Brief

6″ inseam, from $33

Suits thicker legs. 3D comfort pouch.

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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.

Shop Step OneLearn more

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.