The Pro Flex is engineered to move with minimal friction and complete comfort. 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-odor technology that does not wash out.
Fabric: 89% Recycled Polyester, 11% 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.
We offer a 30-day return window for all purchases made directly through our website. To submit a return request, please use our online portal: returns.bn3th.com.
For more information, check out our Frequently Asked Questions page.
ENGINEERED COMFORT
Overall rating: 4.6790123 / 5 from 81 reviews.
The Pro Flex Boxer Brief by BN3TH is praised for its exceptional comfort, snug design, and breathable fabric. Customers appreciate its great support and fit, though opinions on the fabric's thickness vary.
Review topics: [size, fit, look, liner, weight, quality, fabric, legs, material, comfort, style, underwear, feel, pouch, boxers, waistband, briefs, boxer briefs, brand, workout, stink, seam, bn3th, wear, chamois, chafing, moisture wicking, boxer, sweat].
"I bought 3 Pro Flex thinking they would be better than the regular line and I keep having issues with my thighs. But the single one that I bought to try it, has been wonderful. I walk around 6 miles at work daily and they are awesome. If I could send the three that I got, the Pro Flex and get 3 of the regular line, the simple one, I would do it"
"Great fit and very breathable. Can wear all day on a 12 hour shift with no discomfort or excess moisture! They look great too! Good fit for bigger waist sizes. Does not bunches up and the waistband stays put!"
"Most. Comfortable. Underpants. Ever. I've tried some other pouch type brands, and BN3TH is by far my favorite of them all. Great for people with low hangers (such as myself). Do your balls a favor and try a pair."
"Really impressed with the overall package offered by the pro ionic+ boxer. A few highlights are, 1.) These do not ride up. I've found that every pair of thieves and saxx both ride up continuously but these stay out. 2.) The anti stink is really effective. I think you could go 3 active days in a row with these before the funk really appears and I've definitely gone 2 days while traveling without issue. 3.) Moisture management is great! Even on days where I sit all day on an airplane I don't have that wet butt feeling that I get with other boxers (saxx). The only thing about these that is 1 step below saxx is the ball pouch. Beneath boxers have a ball pouch that had a bottom flap that my anatomy doesn't always fall into. These are plenty comfy even when my buds are out of place but the design of the saxx ball park does work a bit better if you ultimate goal is separating your balls from your legs."
"Perfect fit all day"
"Bought two pairs-black and blue. So comfortable when wearing for workouts that I just bought the same again. Love 'em."
"Great quality and fit. Perfect fit r workouts."
"Very comfortable, like them much better than previous UA pairs, love the quality and the feel!"
"Not great. Material feels heavier and less comfortable than expected. Pouch seems kind of weird placement. I don't think I'll get much use out of these."
"The pros rock. Perfect fit (I'm 6'2, 33", wear a medium), breathable, supportive, no ride-up, fast drying, no stink, and best of all, no chafing after 2 months of testing on hilly distances of up to 50K. I run hot and am a heavy sweater, but these babies have kept me cool even in 85F heat. I wore a different brand for Boston this year and chafed badly in the rain -- I wish I'd worn the BN3TH Pros instead!!!"
