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

Watch the video  

SilverAir Merino Wool Underwear
SilverAir Merino Wool Underwear
SilverAir Merino Wool Underwear
Graphite Grey
Jet Black 1
Midnight Blue
SilverAir Merino Wool Underwear
SilverAir Merino Wool Underwear
SilverAir Merino Wool Underwear
Jet Black 2
Jet Black 2
Jet Black 2
Jet Black 2
Jet Black 2
Electric Blue
Electric Blue
Electric Blue
Electric Blue

Boxer Brief Flyless


$ 36.00

  • Jet Black 2
  • Jet Black 1
  • Midnight Blue
  • Graphite Grey
  • Electric Blue
  • S
  • M
  • L
  • XL
  • XXL
    • SilverAir + Merino Wool fabric prevents odor build-up 
    • SmartGrip™ System helps keep leg bands in place 
    • Made from 17.5 Micron New Zealand Merino Wool
    • Flyless design with double pouch for support
    • 90% Merino Wool, 5% Metallic, 5% Spandex (200 gsm)
    • 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 send you a different size or take it back and 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

Based on 137 reviews
5 Star
4 Star
3 Star
2 Star
1 Star
Write a Review Ask a Question
  • Reviews (137)
  • Questions (0)

Thank you for submitting a review!

Your input is very much appreciated. Share it with your friends so they can enjoy it too!
Indiana, USA

Quickly became my favorite underwear

I'm always on the lookout for a better pair of underwear. I've been wearing ExOfficio stuff for a while now, and despite backing numerous Kickstarters and other outlets I've not been able to find anything comparable. Then I received my YAthletics Flyless Boxer Brief. I'm wearing it for work, for athletics, and just sitting around the house. After a few weeks, they've become my favorite underwear by a longshot. I'm on here to order more! The length of the brief is right for me, and the adhesive helps keep them from rolling up most of the time (better than basically every other pair I've tried). The material is soft but has a sturdy feel to it. It dries quickly, and it does a good job of absorbing a little sweat without feeling like it weighs 20lbs. I do feel compelled to mention the sizing due to a remark from another reviewer. He said that he recommended sizing down. That's completely the opposite of my experience. In almost every brand I go with a Large, but I found the XL to be a perfect fit here.

Robert H.
United States

Love them!

Great fit, reasonable pouch, breathable, crazy comfortable. Just wish the flyless version were available in a longer leg.

A Y Athletics Customer
Emilio P.

Pricey but premium

They are super confortable, a bit pricey, but worth the money

Brett B.
United States

Awesome underwear!

I have tried several brands of underwear and these are, without a doubt, my favorites!!

William J.
United States

Best Ever

I’m go commando 99% of the time. However, this is the 5th or 6th pair of these that I’ve bought. I travel a lot and these will keep you squared and feeling fresh over those 8,10, and 12 hour flights. These are the best drawers I have ever owned...period.