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.

SilverAir Merino Wool Underwear
Jet Black 2
Jet Black 2
Jet Black 2
Jet Black 2
    • 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


17.5 Micron Ultrafine Merino Wool. No Compromises.

For the base fabric of this underwear, we sourced ultra fine New Zealand merino wool for it's natural ability to regulate temperature and resist odor. A hint of spandex is added so the underwear does not lose it's shape and a double soft premium waistband feels like a cloud on the skin and won't 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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Robert F.
United States

The most comfortable underwear ever!

Merino wool turns out to be the best fabric for underwear. Y Athletics’ silver and merino wool underwear does not smell after being worn all day and the the comfort of the wool is far superior to cotton. These boxer briefs are expensive, but the level of comfort make them worth the price.

Brandon B.
United States


While the boxers are very comfortable, they're over priced for having all the design flaws that they do. The silicone simply doesn't work AT ALL. The waste band is way to wide and bunches up for guys like me who have a few extra pounds. I had to take them to a professional tailor to have the waste bands folded in half and sown. Now they don't bunch up at all. That is the way they should've been designed in the first place. There is no fly opening which forces the wearer to constantly diminish the waste band's elasticity over time. The shirts are comfortable, same as the boxer briefs, but the neck opening is WAY to large. I have a 16.5" neck. I hope this constructive criticism helps Y Athletics improve their designs in the future.

Martin D.


FR:// Pour avoir essayer le Boxer Brief 8" ( Boxer Brief Long ) et le Boxer Brief du Kickstarter. Je préfére le Boxer Brief 8" ( Boxer Brief Long ) , car il est assez long pour moi, parce que j'adore les Boxers long. Coté confort, c'est un vrai petit nuage de douceur. Avec ces petites bande de caoutchouc le Boxer ne bouge pas et reste en place. Le seul petit hic est que la taille M est légèrement grand pour moi. La prochaine fois je vais essayer la taille S. EN:// To have tried the Boxer Brief 8 (Boxer Brief Long) and the Boxer Brief of the Kickstarter. I prefer the Boxer Brief 8, because it is long enough for me, because I love Boxers long. Side comfort, it is a real little cloud of softness. With these small rubber band the Boxer does not move and stays in place. The only small snag is that size M is slightly big for me. Next time I will try the size S.

Ásgeir J.

Love from a colder climate

Hey hey, gotta say I'm incredibly happy with the underwear. After your sock kickstarter I was always hoping that you'd release another merino product. Mentioned it in a previous feedback msg and was glad when I heard about the underwear.! Already got six pairs plus a couple I gave away :)

James O.
United States

Very comfortable

I’ve had your longer underwear for a while now and I can honestly say they are my favorite pair. I plan on buying another pair or two soon.