The award-winning Pro Ultra is designed for max intensity and elite performance with super premium, lightweight fabric that is highly breathable, supportive, and silky smooth. These Boxer Briefs feature The Original 3D Pouch to ensure everything is separated and supported so you can always put your best foot forward.
The fabric is a breathable, moisture-wicking polyester blend mesh featuring Ionic+® anti-odour technology that does not wash out.
Fabric: 84% Recycled Polyester, 16% Spandex
Free standard shipping is available on all orders above $75 (after discounts and before taxes).
All available shipping options will be visible at checkout. We ship orders within 1-2 business days, but this can increase during promotional periods.
For more information, check out our Frequently Asked Questions page.
ENGINEERED COMFORT
Overall rating: 4.875 / 5 from 40 reviews.
The Pro Ultra Boxer Brief in Slate Grey is praised for its lightweight, breathable, and supportive fabric. Customers highlight its effective separation and support features, making it a top choice for performance and comfort.
Review topics: ["fit","fabric","material","underwear","feel","comfort","seams","boxers","style","weight","sweat","icon"].
"The BN3TH may be the best men's underwear I've ever owned. I say maybe because they are super soft and live up to the anti-order claim so they're great when travelling. That said, I still like the classic icons and the pro flex, too. The icons are probably the softest, and the pro ultra the smoothest, if that makes sense. But overall, it's tough to find any fault with the pro ultras."
"I've tried a few brands of premium men's underpants and so far, I'd say these have the best fit and comfort. Build quality is excellent. I'll probably replace many of my Saxx pairs with these."
"These are my very favourite boxers for wearing anytime. Great in hot weather, and I just find them really comfortable for regular daytime underwear. They hug your body and "stay put" even when you pull on your bluejeans."
"These Pro Ultra briefs (slste grey)fit great and feel amazingly soft. Another great product from Bn3th."
"This is my third order. The underwear and cycling liners are very good."
"I Enjoy. No complaints at all"
"Great fit, love them. Long time customer."
"Great fit and comfortable"
"These boxers are the best of the best for high function underwear. No riding up, great comfort and no odour."
"The pouch allows enough volume/space, that's great!"
