Flex Trunks

$25.99 USD 7 reviews

Flex Trunks

$25.99 USD 7 reviews

Our Flex Trunk Underwear style has been completely upgraded! Designed to be performance ready, the custom flex-knit fabric blend offers complete support, breathability and cool touch mesh for optimal temperature control.Learn More

ColorSky Blue/Navy
Sky Blue/Navy
Forest Camo
Asphalt Camo
Dark Olive
Size Size Guide
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.


Bundle & Save 3-Pack

Flex Trunks

Our Flex Trunk Underwear style has been completely upgraded! Designed to be performance ready, the custom flex-knit fabric blend offers complete support, breathability and cool touch mesh for optimal temperature control.

Now in all around enhanced fabric, experience improved support with improved breathability and ultimate flex-fit comfort. 


Customer Reviews
5.0 Based on 7 reviews
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Gunmetal black flex trunks

Ronald B.

As I said before this is the one never been this comfortable in a brief

  • Comfort UncomfortableAverageVery Comfortable
  • Your Body Shape ThinNormalAthleticBuiltRound
  • Your Size in Bottoms SmallMediumLargeX-LargeXX-Large
  • Your Size in Tops SmallMediumLargeX-LargeXX-Large
  • Size Runs SmallTrue to SizeRuns Large

Worth the $

Daniel M.

I know they can be pricy but they are totally worth it. They are extremely comfortable and perfect for casual or workout scenario's. Quick to dry, flexible and breath well yet are thick enough to keep you from freezing.



Edgar G.

Flat out amazing perfect for training

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