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

119

Flex Trunk

119

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

Color
Maroon Red
Black
Gray
Green
Color:
Size
Size Guide

Flex Trunk

Signature 40° Side-Fly • Anti-Odor • Temperature Control • 84% Polyester • 16% Spandex


"Lightweight, comfortable, and durable. I can wear the Flex Trunk anywhere with confidence that they will perform!"




  • You deserve better boxers


      • Cool Where it Counts

    84% Polyester and 16% Spandex, our mesh zones are strategically placed to remove heat and keep you cool when and where it matters most.

      • Side Fly Innovation

    BYLT's signature 40° side-fly offers a more comfortable draw and easier access. It's time you see how we changed men's boxers for the better.

      • No Roll. No Marks.

    The Flex Trunk's no-roll waistband fits comfortably while leaving you mark free after a long day. Say goodbye to boxers that roll and ride up.




    Men's Temperature Control Flex Trunk Underwear Pack by BYLT Basics.



 

Customer Reviews

4.8 Based on 119 reviews
5 Star
81% 
96
4 Star
17% 
20
3 Star
2% 
2
2 Star
0% 
0
1 Star
0% 
1
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06/14/2019

Nice, but..

Eddie C.

Waist band feels good and feels like good quality. The only complaint I have is the stitching inside rubs against me too much.

06/12/2019

The best pair of underwear ever

Benjamin K.

These are so dope. They don't bunch, they're extremely comfortable, and the breathe. Dis right here mane

06/12/2019

I like them

Nihal B.

I like them a lot!

06/11/2019

Comfortable!

Jesse B.

Not too tight, just right and easy range of movement

06/11/2019

Briefs/ Henley/drop cut

Julia S.

Great quality and a extremely comfortable fit. I will buy more

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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.