Trunk Size Chart

Fit Profile: True to Size

Size: S M L XL XXL
Waist: 28-30" 31-34" 35-39" 40-43" 43-46"
Outseam: 6-7" 7-8" 8-10" 10-11" 11.5"

  *Standard Trunk Size Guide Measurements:

Waist: Circumference measurement of waist. Trunks are designed to fit above the hips.

OutseamMeasure the length from the intersection of the waistband & hip to the bottom hem, follow the outer seam.

*Product measurements can vary by 1/2" 

Your purchase includes our "Love Your Fit" guarantee

If you don't love the fit, send it back and we'll exchange the size so you're happy.

 

Flex Trunk

125

Flex Trunk

125

Designed with increased compression, breathability, and support for your more intense days. Learn More

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Flex Trunk ">
Description
Details
Flex Trunk

The Flex Trunks were designed for your more intense days. This custom blend has increased compression, breathability and support. It also features cooling mesh zones for anti-odor and temperature control.

The Flex Trunk
Polyester 84% POLYESTER
Spandex 16% SPANDEX
Flex Trunk
Breathable BREATHABLE
Anti-Odor ANTI-ODOR
The BYLT Difference
Style, performance & comfort are our design principles that we use in creating our entire line.
Our Guarantee
It is critical to us that you are happy with your purchase and that you love the items you receive. We know things happen, if you are not 100% satisfied, we will try our hardest to make it right.
Experience Premium
We're here to upgrade your basics. Every BYLT product is rigorously tested before it's shown to the world to ensure it is nothing less than premium.

Customer Reviews

4.8 Based on 125 reviews
5 Star
82% 
102
4 Star
16% 
20
3 Star
2% 
2
2 Star
0% 
0
1 Star
0% 
1
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06/29/2019

Flex Boxer Brief

Joseph A.

Very comfortable throughout the day. Worth the price and will definitely buy more boxers.

06/26/2019

Great product good customer service

Erich H.

Good fitting great looking underwear.

06/25/2019

Amazing Undies

Joseph F.

Great for the gym and the streets, and they look super cool, too!

06/25/2019

Great pair of underwear

Vince T.

Great for working out.

06/21/2019

Tried these briefs and...

Russ W.

I LOVED THEM! I wore them at the gym and in the ocean under swim shorts. Loved them!

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Our Signature Fabrics

BYLT Blend™ Fabric

Premium signature blend of Cotton, Polyester, and Spandex. Perfect for your essential everyday shirt, leaving you with that flawless BYLT Fit.

LUX Blend™ Fabric

High-quality performance blend of Cotton, Polyester, and Spandex. Reactive fabric allows for slight reduction in length to provide the perfect structured fit.

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Trunk Size Chart

Fit Profile: True to Size

Size: S M L XL XXL
Waist: 28-30" 31-34" 35-39" 40-43" 43-46"
Outseam: 6-7" 7-8" 8-10" 10-11" 11.5"

  *Standard Trunk Size Guide Measurements:

Waist: Circumference measurement of waist. Trunks are designed to fit above the hips.

OutseamMeasure the length from the intersection of the waistband & hip to the bottom hem, follow the outer seam.

*Product measurements can vary by 1/2" 

Your purchase includes our "Love Your Fit" guarantee

If you don't love the fit, send it back and we'll exchange the size so you're happy.