A high performance boxer-brief made with luxurious 17.5 micron merino wool and real silver. Our custom double knit fabric weighs 200gsm and has a terry finish on the inside that is incredibly comfortable and a dream to wear. The silver neutralizes odor causing bacteria and takes the natural anti odor performance of merino to the next level. A silicone grip system prevents the legs from riding up or bunching. The 2.0 version now features a gusset reinforced with nylon that is more durable against abrasion.

SilverAir Merino Wool Boxer Brief 8" w/Fly
SilverAir Merino Wool Boxer Brief 8" w/Fly
Jet Black 2
Jet Black 2
Jet Black 2
Jet Black 2
Jet Black 2
Jet Black 2
Midnight Blue 2
Midnight Blue 2
Graphite Grey
Graphite Grey

Boxer Brief 8" w/Fly

42 reviews

$ 40.00

  • Jet Black 2
  • Graphite Grey
  • Midnight Blue 2
  • S
  • M
  • L
  • XL
  • XXL
    • Silver and Merino Wool prevents odor build-up 
    • SmartGrip™ System helps keep leg bands in place 
    • Made from 17.5 Micron Merino Wool
    • Inseam length: 8"
    • 90% Merino Wool, 5% Metallic, 5% Spandex (200 gsm)
    • Manufactured in China


(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


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

SilverAir Merino Wool Underwear

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 42 Reviews
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Randy H.
United States United States
So far, so good!

I've got many pairs of these, this being the first shipment with a fly. Not really noticing the fly, but it does seem like the material is a little different from the previous versions. Not sure yet if that's a good or bad thing, let's see how they wear over time. The previous versions wear GREAT! I've got lots of time out of them and still going!

United States United States
SilverAir Merino Wool Boxer Brief

This boxer brief 8" is excellent in comfort and performance during cold days!

Patrick B.
United States United States
Best undies ever

I don't mind spending money on good undies, and Yathletics delivers some awesome undies! Stretching where needed, hugging throughout, and silver thread is really just icing on the cake

Stuart S.
United States United States
The best boxers for sports that I have

I really appreciate the quality-support-and design. The material is perfect for sports. I play high level singles tennis generally for an hour and a half. These boxers feel like part of me under my tennis shorts. They are like a second skin. I have both lengths and have a separate spot in my draw for them. I need more.

A Y Athletics Customer
Chris T.
United States United States

WOW! Put on my new, straight out of the package,Y Athletics Silverair Merinos; did two hours of hard, sweaty yard work and was amazed at how dry and comfortable my boxer-briefs were, compared to my drenched shirt! I will have to get some of your t's. Great product.