Shorter than our standard boxer-brief, the trunk is made with luxurious 17.5 micron merino wool and real silver. The custom double knit fabric weighs 200gsm and has a terry finish on the inside that is incredibly comfortable and a dream to wear. Silver yarns in the fabric are permanent and neutralizes odor causing bacteria. Combined with the natural anti odor performance of merino, this product takes it up a notch so you can get more wears between washes (when you need to). The trunk does not have the silicone grip found on our Boxer-Brief.

SilverAir Merino Wool Trunk
Graphite Grey
Jet Black 1
Midnight Blue
Jet Black 2
Jet Black 2
Midnight Blue 2
SilverAir Merino Wool Trunk


$ 40.00

  • Jet Black 2
  • Midnight Blue 2
  • Jet Black 1
  • S
  • M
  • L
  • XL
  • XXL
    • SilverAir + Merino Wool fabric prevents odor build-up 
    • Made from 17.5 Micron Merino Wool
    • Horizontal fly provides easy access
    • 90% Merino Wool, 5% Metallic, 5% Spandex (200 gsm)
    • Manufactured in China

    Measurement Guide



(based on body measurement in inches)


If you don't love your first pair, you can return it within 30 days of purchase for a full refund or a different size.


17.5 Micron Ultrafine Merino Wool. No Compromises.

For the base fabric of this underwear, we sourced ultra fine 17.5 Micron New Zealand Merino Wool for it's natural ability to regulate temperature and resist odor, while having a buttery soft hand feel that is dry to the touch. SilverAir metallic yarns neutralize bacteria and reinforce odor-control. Finally, a hint of spandex is added so the underwear does not lose it's shape over time. The waistband is constructed with a double-soft nylon that feels like a cloud on the skin and will not leave any marks.

SilverAir Shirt


Taking odor control to a whole new level.

Merino wool is naturally resistant to odor-causing bacteria, but silver actively neutralizes any bacteria it comes into contact with. That's why we infuse our SilverAir technology into the underwear to give it the best possible anti-odor performance in the market.

SilverAir Sock

SilverAir Merino Wool Underwear

SilverAir Merino Wool Underwear

SilverAir Merino Wool Underwear

SilverAir Merino Wool Underwear

SilverAir Merino Wool Underwear

Customer Reviews
4.6 Based on 13 Reviews
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Rafael R.
United States United States

It's very good. But I do wish there was a flyless option.

United States United States
Nice pair of trunks

Merino wool base layers work great in hot climates. I have used them all over the world. I like the shorter inseam on these. I actually prefer a 1" or 2" inseam but these are more stylish than the 7" inseams most are making.

David T.
Australia Australia
Great for Comfort and for Travel

Great for travel. You can wear it for a week at a time. It can be easily washed and dried. I have been wearing them for a couple of years now.

Rafael R.
Paraguay Paraguay
Almost perfect

They are just top notch. Just wish they made a flyless version.

Brian J.
United States United States
Great gear. Love the fabric

Great gear. Love the fabric and the fit. Best underwear I've ever worn. I will be buying more soon.