Floral Sport Bundle
Pro Flex Max Boxer Brief: Roses-Dark Navy | BN3TH Underwear
Floral Sport Bundle
Pro Flex Max Boxer Brief: Roses-Dark Navy | BN3TH Underwear
Pro Flex Max Boxer Brief: Roses-Dark Navy | BN3TH Underwear
Floral Sport Bundle
Pro Flex Max Boxer Brief: Roses-Dark Navy | BN3TH Underwear
Floral Sport Bundle
Pro Flex Max Boxer Brief: Roses-Dark Navy | BN3TH Underwear
Pro Flex Max Boxer Brief: Roses-Dark Navy | BN3TH Underwear
Tap to zoom

Floral Sport Bundle

Everyday Sport.

$78.00 USD $55.00 USD
Pro Flex Max Boxer Brief: Roses-Dark Navy (Size):
Pro Flex Boxer Brief: Black (Size):
Pro Flex Boxer Brief: Black Rhubarb (Size):

The Pro Flex & Pro Flex Max 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 Pro Flex Max is designed with a 7" inseam and a wide waistband, where as the Pro Flex has 6.5" inseam. 

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

The Original 3D Pouch
Breathable mesh
Friction-free smooth finish
Ionic+® Anti-Odor Tech
Premium no-roll waistband
Chafe-Free Flatlock Stitching

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.

files/2023-08-31-fit-and-function-pro_a113c8b9-1052-4de8-a34b-5ab463503246.svg

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.

Returns or exchanges will be processed up until January 31, 2026 for items purchased at a discount of less than 30% between November 8 and December 26, 2025. Products discounted by 31% or more will be final sale. 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.