Sale

Flex Trunk Custom 3 Pack

145 reviews
Sale

Flex Trunk Custom 3 Pack

145 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 145 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!

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.

04/18/2020

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.

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.