Sale

Flex Trunk Custom 3 Pack

(FINAL SALE)

149 reviews
Sale

Flex Trunk Custom 3 Pack

(FINAL SALE)

149 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 149 reviews
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07/18/2020

Best briefs ever?

Eric G.

Definitely the best boxer briefs I’ve had. So much that I have one for everyday of the week, even two extra for laundry days.

05/25/2020

Great underwear

Alex R.

Fits good, never purchased underwear like this. I don’t like briefs and tight underwear in general but these are “fitted” and give your boys some breathing room. Plus girlfriend definitely approves

05/17/2020

Amazing Brand

Edgar M.

Great Quality!

05/12/2020

Perfect fit

Daniel G.

Fit perfect and the girlfriend loved them on me

05/01/2020

Flex Trunk

Michael G.

The best part about your Flex Trunks is the opening is vertical not horizontal. Horizontal openings over time become irritating. Personally, I wish there was no opening and more support. I don't know who actually uses that opening to use the restroom. I imagine most just pull the waistband down...

04/26/2020

Excellent

Gabriel C.

To thick,not breathable but comfortable.

04/22/2020

Great add to my clothes

Joe R.

I’ve bought the shorts and shirts so decided to give the underwear a try. Great fit, true to size and awesome for everyday or working out.

04/17/2020

My 3rd Pair

Joe R.

This is my third pair. Both trunks and now boxer briefs. I have several of the shirts and shorts and seized why not give the underwear brand a try. Happy I did and highly recommend. Fit is great and love them for working out.

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!

03/23/2020

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.

02/02/2020

All Day vs Flex

dave d.

Received a pair of all day version and when I ordered additional pairs did not realize there was a difference between flexible in all day. Much prefer the all day.

01/20/2020

Amazing Underwear

DN

These are most definitely the best pair of underwear I've ever worn.

01/07/2020

Great

Christopher J.

Perfect fit ! Comfort & feel is amazing. It’s a must purchase

12/13/2019

Best

Ashley F.

This is not a first time purchase of these boxers. They are my husbands absolute favorite and he only likes to wear these over any other brand he’s tried.

Trunk Size Chart

Fit Profile: True to Size

Trunk Size Chart
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.