Sale

Flex Trunk Custom 3 Pack

141 reviews
Sale

Flex Trunk Custom 3 Pack

141 reviews

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

Step 1: Pick your size

Size
Size Guide

Step 2: Select 3 Colors

Color # 1
Maroon Red
Black
Gray
Green
Color:
Color # 2
Maroon Red
Black
Gray
Green
Color:
Color # 3
Maroon Red
Black
Gray
Green
Color:
Customer Reviews
4.8 Based on 141 reviews
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04/11/2017

Flex Boxer Briefs Live up to Hype

Dale H.

Excellent compression fit on legs but because I'm on the line for size I'd order up one size next time. Additional colors would be great!

03/29/2020

Great Fit & Breathable

Nick

If you know you know... Underwear for dudes is not created equal that's for sure; Bylt underwear are lightweight, breathable, and give just the right amount of support for the boys without feeling constrained. I like that the waistband is not tight, and gives me freedom. Bring on more colors!

03/24/2020

Best athletic trunk ever �

Max C.

Excellent fit and very comfortable. Love that they have a fly opening. Nailed it.

02/28/2020

TRULY COMFORTABLE AND GREAT QUALITY!

Evan J.

I'm absolutely in love with how comfortable these are, the fit is perfect, the feel is perfect, the price is not so perfect....That's a lot of money to drop on underwear...I would like to purchase 5 or 6 more pair to replace my current underwear but thats a chunk of change.

02/22/2020

Very comfortable

Ryan

These underwear are extremely comfortable and fit great to your body. Definitely worth the price.

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.