A high performance boxer-brief made with luxurious merino wool and fused with our SilverAir anti-odor technology. An intelligent grip system prevents the legs from riding up or bunching. Perfect for travel but so comfortable you'll want to wear them every day.

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SilverAir Merino Wool Underwear
Graphite Grey
Jet Black 1
Midnight Blue

Trunk w/Fly


$ 36.00

  • Jet Black 1
  • Midnight Blue
  • Graphite Grey
  • S
  • M
  • L
  • XL
  • XXL
    • SilverAir + Merino Wool prevents odor build-up 
    • SmartGrip™ System helps keep leg bands in place 
    • Made from 17.5 Micron New Zealand Merino Wool
    • 90% Merino Wool, 5% Metallic, 5% Spandex
    • Manufactured in China

    Measurement Guide


We want you to love your gear and offer a try-on guarantee for your first pair of underwear. If you don't love it, let us know within 30 days of purchase and we'll either send you a different size or issue a full refund.


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


A grip system that prevents ride-up

Inspired by grip systems in high-end cycling apparel, we designed a custom grip using soft silicones that you barely feel against your skin but which creates just enough resistance for the leg band to stay in place.

SilverAir Shirt

Customer Reviews

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  • Reviews (5)
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Arjen L.

Great stuff!

I already had the boxers (which are great btw) but the briefs are even better! Small but noticeable improvements make me love the briefs. Keep going on the way you are going!

Jason M.
United States

Love them

I love these underwear. They are super comfy. Only thing I would change is the waistbands roll a lot.

Keith L.
United States

Money spent better elsewhere

The positive, the claim of not stinking after multiple days use is true. The claim of an "intelligent grip system prevents the legs from riding up or bunching." is completely false. They ride up and bunch almost immediately. If the underware was cheaper I'd give itr a higher rating. At this price point, there are better options available, such as Lululemon.

Joseph M.
United States

The Best!

This product is simply the best! Well worth the extra money with ZERO buyers remorse. These undies work EXACTLY as advertised. No stink no problem!

D.J. D.
United States

I was hoping for better

I was glad to see Y come up with trunks because I prefer the shorter length. But, the trunks aren’t as comfortable for me: The legs bunch up under the crotch & the no slip grips do indeed slip. Last, if you have a body like the Y models, the waistband is great; for the rest of us, it accentuates any flabbiness you have (same as the original line).