Pro Flex Boxer Brief: Black
A male model standing in profile wearing black boxer briefs against a smooth gray studio background. Pro Flex Boxer Brief: Black
Black shorts with a visible brand logo on a light gray background. Pro Flex Boxer Brief: Black
Pro Flex Boxer Brief: Black
Pro Flex Boxer Brief Original 3D Pouch Technology
Pro Flex Boxer Brief: Black
Pro Flex Boxer Brief: Black
Close-up of a male model's lower torso wearing black athletic compression underwear with a wide black waistband embossed with the brand name BN3TH. Pro Flex Boxer Brief: Black
Pro Flex Boxer Brief: Black
A male model standing in profile wearing black boxer briefs against a smooth gray studio background. Pro Flex Boxer Brief: Black
Black shorts with a visible brand logo on a light gray background. Pro Flex Boxer Brief: Black
Pro Flex Boxer Brief: Black
Pro Flex Boxer Brief Original 3D Pouch Technology
Pro Flex Boxer Brief: Black
Pro Flex Boxer Brief: Black
Close-up of a male model's lower torso wearing black athletic compression underwear with a wide black waistband embossed with the brand name BN3TH. Pro Flex Boxer Brief: Black
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Pro Flex Boxer Brief

Black

Everyday Sport.

$28.00 CAD $22.40 CAD



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-odour technology that does not wash out.

Fabric: 89% Recycled Polyester, 11% Spandex

The Original 3D Pouch
Breathable Mesh
Friction-free smooth finish
Ionic+® Anti-Odour tech
Premium No-Roll Waistband
Chafe-Free Flatlock Stitching

Model shown is 6’0” tall, 175lbs, has a 32” waist and is wearing a size medium.

This 6.5" inseam Boxer Brief has a secure feeling fit.

View Size Guide


All BN3TH fabrics are soft and made from a performance stretch fabric. If your measurements are between sizes, select a larger size for a looser fit or a smaller size for a tighter fit.

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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

WHY WE MADE THIS

The Pro Flex is all about keeping the sweat wicked, your form tight and the body feeling fresh. So go run, lift, climb, play…the Pro can tackle any workout without holding you back. And with Ionic+® anti-odor technology, you can focus on what matters most.

SUSTAINABILITY MATTERS

Made with post-consumer recycled polyester fabric and elastic, this product is certified to the Global Recycled Standard (GRS).
OEKO-TEX® certified fabrics guarantee that our end products are tested and proven free from harmful toxic chemicals.

Overall rating: 4.8071427 / 5 from 560 reviews.

AI Generated Review Summary

The Pro Flex Boxer Brief in Black is praised for its perfect fit, amazing look, and comfortable fabric. Customers appreciate its breathable, moisture-wicking material and durable quality. However, some have noted inconsistencies in sizing.

Summary topics

  • Fit (28%): Based on a significant number of customers, the general consensus is that the product has a perfect fit.
  • Look (4%): Customers keep praising the look of these products, with many describing them as amazing and great.
  • Fabric Comfort (6%): It was highlighted by customers that the fabric is incredibly comfortable and provides great protection against chafing.
  • Quality (5%): Customers expressed satisfaction with the great quality of the product, which was mentioned multiple times in the reviews.
  • Comfort (4%): Customers loved the amazing comfort and fit of the product, making it the most common opinion.

Review topics: ["size","fit","fabric","support","length","material","style","colour","design","feel","look","problem","quality","comfort","pattern","addition","band","boyfriend","legs","price","wear","underwear","boxers","boxer briefs","trunks","pair","boxer","briefs","pro","buy"].

Review highlights

  • "I love the comfort and fit, and I love the feel of the material."Walter M.
  • "great design, fit, feel and quality - super comfortable and look great!"John M.
  • "Supportive but not restrictive, comfortable fabric that is actually durable, perfect fit, sweet design."Daniel C.

Reviews

"Great fit and a great product."

Troy (5/5)

nice fabric very lightweight

"nice fabric very lightweight"

Michael B. (5/5)

"Probably the most uncomfortable underwear ive ever had, and really expensive for what they are."

Michael (1/5)

Great product

"Purchased for my son, he loves them. Super comfortable."

Katie F. (5/5)

"Confortable mais les coutures au niveau des cuisses semble épaisses et frotte quand je marche."

Guillaume (4/5)

Pro Flex Trunk

"I purchased 3 of the new Pro Flex trunks from these guys. I have been wearing the trunks for a couple of years now and love them! The fit on the trunks are smaller than the regular trunks and the elastic waistband is very tight. I really don't care for the type of fabric that they use for the Pro Flex trunks. Not sure whether I'm going to return them or not yet. I much prefer the regular trunks"

Rick T. (4/5)

Awesome!

"Awesome fit for a great price!"

John R. (5/5)

"Vraiment confortable"

verrier (5/5)

Perfect for sport

"He says it feels like he is wearing nothing"

Christine C. (5/5)

Perfect

"Very comfortable"

Christine C. (5/5)

Q&A