U31 ReAktiv Trunk Underwear - Iron Sulfur– 2EROS Men's U31 ReAktiv Trunk Underwear - Iron Sulfur | Underwear Trunks | 2EROS

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U31 ReAktiv Trunk Underwear - Iron Sulfur

or AUD$8.00 fortnightly with Afterpay More info

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3 reviews

We've developed our REAKTIV underwear with a variety of premium fabrics from sweat-wicking Tactel and 4-way stretch mesh to create a garment that is both comfortable and functional.

It features the iconic CURV technology and a single layered pouch, which contours and shapes all your assets in a natural way. This also creates a 'contact-less' support to reduce chaffing and sweating.

With our REAKTIV underwear, whether you are running at the gym or running for the bus, you will feel cool and dry with the right amount of support and mobility!


  • CURV technology
  • Single layer pouch
  • 4 way stretch mesh
  • Premium Sweat Wicking Tactel
  • Form fitting


Pouch and Back Panel: 100% Tactel

4 Way Stretch Mesh: 88% Nylon, 12% Elastane

How to keep your garments 'As New'

1. Cold hand wash for best results
2. Use colour safe detergent
3. Turn inside out when washing
4. Hang dry in shade
5. Do not iron
6. Avoid contact with rough surfaces
7. Do not bleach
8. Do not tumble dry
9. Do not dry clean

Hip Size Guide

We designed our swimwear, underwear and shorts to sit low on the hips.
So its only right to measure your hip instead of your waist. Your hip is larger than your waist. If this is your first time buying 2EROS we recommend going up a size.

View the video so you can choose the right 2EROS size.

A Comparative Guide

Zara, Abercrombie, ES(Spain) & Calvin Klein (premium collection) will be the same sizing match to our brand. If you wear Toots(Japan) our sizing is bigger so you will need to go down a size. If you wear Aussiebum our sizing is smaller so you need to go up a size.

INCH 28 - 29 30 - 31 32 - 33 34 - 35 36 - 37 38 - 39
CM 72 - 76 77 - 81 82 - 86 87 - 91 92 - 96 97 - 101

Chest Size Guide

This is an approximate conversion table to help you find your chest size.
Size XS S M L XL
INCH 34 - 36 36 - 38 38 - 40 40 - 42 42 - 44
CM 86 - 90 91 - 96 97 - 101 102 - 106 107 - 111

Select a size

  • XS XS
  • S S
  • M M
  • L L
  • XL XL
Customer Reviews
5.0 Based on 3 Reviews
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Best Underwear I've Owned!

It doesn't matter if you're ripped or not, you'll feel sexy in these! The design is comfortable, and really highlights your assets, both front and back. The pouch keeps everything cool and separate from the legs, and the mesh part of the fabric increases airflow. The wife said I looked incredibly sexy; I subsequently bought a few more!

Ben L.
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Nice undies!

Nice fit, love the colour

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  • Quality


I own all 3 color variations of these trunks. The fit is excellent, the pouch is comfortable and keeps everything away and presentable, and the mesh material on the sides helps with airflow. I would totally buy more of the ReAktiv series if they came out with more color combinations, or if they were slightly longer in the leg like the ****** line (but keeping the waist, style, pouch, and material of the ReAktiv).

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