A lighter and stronger take on underwear, we created the fabric with plenty of nylon for strength, modal for softness, spandex for stretch, and SilverAir yarns for odor resistance. The knit structure of the fabric is open and breathable, and works very differently than our Merino Wool Underwear. Instead of pulling moisture into the core, it wicks it away. While the anti odor performance will not be as effective as our merino products, it dries faster and can be washed and ready to wear within a few hours. This product does not feature the SmartGrip System found in our Merino Wool underwear; otherwise, the construction and components are identical.


SilverAir Ultralight Boxer Brief w/Fly
Carbon Black
Carbon Black
Carbon Black
Carbon Black
Stone Grey
Stone Grey
Stone Grey
Stone Grey
Polar White
Polar White
Polar White
Polar White

Boxer Brief w/Fly


$ 28.00

  • Carbon Black
  • Stone Grey
  • Polar White
  • S
  • M
  • L
  • XL
  • XXL
    • Lightweight open-knit fabric dries quickly
    • SilverAir Technology reduces odor
    • Double soft waistband doesn't roll over or leave marks
    • 50% Nylon, 35% Modal, 10% Spandex, 5% Metallic
    • Manufactured in China


We offer offer free returns and exchanges within the U.S. on all concept products (except for underwear and socks which are not returnable once opened). However, because we make concept products in limited quantities, you have 14 days from the date of delivery to decide if you want to keep the product or initiate a return.

Customer Reviews

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Joseph H.
United States

Great workout/everyday underwear

I've owned a number of premium underwear brands, including Y's own SilverAir Merino variety. The fit of these is pretty much the same, which is to say it's very good. Enough support for workouts and HIIT, but not too much so that it's still very comfortable to wear as a daily driver. In fact, they are one of the most comfy boxer briefs I've ever worn. Compared to the merino underwear, these are a lot lighter and airier. The merinos are great to wear as travel underwear, as well as for gym days. These new ones would be equally good for gym days, but I'd feel a lot better about running in them since they're so much lighter. I can't attest to the durability of these yet since they're brand new, but because they are so thin and light, I hope they hold up as well as some of my other premium activewear. We'll see! Otherwise, highly recommended.

A Y Athletics Customer
Trevor K.
United States


For those who like but think the standard fabric is a bit 'heavy' this is the perfect fabric. I re-upped and bought a few more after taking these for a spin. I will get more when/if they become available in a square cut which is my fit of choice.

Spencer B.
United States

Perfect for long stints of exercise

The soft feeling of these boxers are amazing when you get the chance to train all day. There is no chafing and the flyless boxer allows you to move freely without fear.

Charles W.
United States

Love them

Yes, they are awesome underwear. Buying more !

Will S.
United States

Underwear you can’t wait to put on

Just saying. My new favorite