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Flex Trunk

83
Size Guide
Flex Trunk Size Chart

Trunk

Fit Profile: True to Size
Size: S M L XL XXL
Waist: 28-30" 31-34" 35-39" 40-45" N/A
Leg: 6-7" 7-8" 7-8" 8-10" N/A

 

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.

 

Color
Black
Gray
Green
Size

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 40º 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

Based on 83 reviews
5 Star
77% 
64
4 Star
19% 
16
3 Star
2% 
2
2 Star
0% 
0
1 Star
1% 
1
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12/08/2018

The Search is Over.

Richard M.

Every item I have purchased from BYLT, I have been extremely happy with what I receive. Their clothes don’t shrink. They fit perfect. They’re more comfortable than any other shirt I’ve tried and I have searched far and wide. I am a dedicated customer and would recommend BYLT to anybody interest. As the saying goes, you get what you pay for and this is well worth the price tag.

11/28/2018

Stay with the flex

Michael D.

The two pairs of flex are quite possibly the best underwear I’ve ever worn. Not as happy with the two pair of all day underwear. Wish I just bought four pairs of the flex. But oh well live and learn. Only 50 dollars down the drain. By the way the drop cut shirts are simply awesome! Great company making well made clothing. I have every color shirt plus some duplicates to wear just to the gym.

11/27/2018

Terrific Trunks

James R.

These are super comfortable, look great and fit perfectly!

08/29/2018

Excellent design

Brian C.

Very comfortable and good design.

08/23/2018

Great material

Billy

Very stretchy and snug fit. Also very breathable in warm weather.

Flex Trunk Size Chart

Trunk

Fit Profile: True to Size
Size: S M L XL XXL
Waist: 28-30" 31-34" 35-39" 40-45" N/A
Leg: 6-7" 7-8" 7-8" 8-10" N/A

 

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.