Underwear Engineered for Body Type — Not Just Size.

Most underwear is designed for waist size alone.

ALPHX is engineered for how real bodies are built — including thighs, and glutes.

Two distinct fits. One uncompromising standard of comfort.

Explore the Fit System

Trusted by men who expect more from what they wear every day.

Modern Fit

Athletic Fit

Prefer to shop by style?

Upgrade Your Underwear Rotation

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    Modern Fit Bundles

    Designed for slim-to-average builds.
    A streamlined fit with everyday comfort.

    Build your rotation and save.
    20% off 3 • 25% off 5

    Mix briefs, trunks, and boxer briefs.
    Premium essentials made to wear daily.

    Shop Modern Fit Bundles
  •  

    Athletic Fit Bundles

    Engineered for muscular thighs and glutes.
    More room where it matters. Zero ride-up.

    Build your rotation and save.
    20% off 3 • 25% off 5

    Mix styles and colors across the collection.
    Performance comfort built to move daily.

    Shop Athletic Fit Bundles

Real Customer Reviews — Honest Feedback You Can Trust

  • “As someone with thicker thighs, these fit perfectly. Comfortable with no ride-up at all.”

    Jordan

  • “Using the fit guide, I found the right size immediately. The fit is spot-on and very comfortable.”

    — Nicolas E.

  • “Finally, underwear that’s actually cut right. Comfortable, supportive, and stays in place all day.”

    — Preston

  • “Lightweight, supportive, and the right amount of room. Easily the most comfortable underwear I own.”

    — Anton R.

  • “I was skeptical at first, but these completely changed my expectations. The comfort is unmatched.”

    — Trice J.

  • “I’ve tried a lot of brands, and these are by far the best fitting. I’ll definitely be buying more.”

    — Nate M.
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Eco-Friendly Comfort That Performs

  • 94% plant based fibers
  • Ethically sourced and manufactured
  • Carbon offset shipping
OUR COMMITMENT

Answers to the most common questions about our underwear.

How would you describe the ALPHX fit?

Our fit is modern and streamlined—cut slim through the hips and seat to reduce excess fabric that can bunch or ride up. Thanks to a 6% spandex blend, our underwear offers plenty of stretch for a comfortable, body-skimming fit.

Prefer a looser or more relaxed feel? We recommend sizing up.

Have larger or more muscular thighs? Choose our Athletic Fit, designed with extra room through the leg while keeping the same great waist fit.
Will alphx underwear stretch out over time?

Our underwear is made with 6% elastane for exceptional stretch and recovery, so it moves with you and holds its shape—delivering a consistent fit, wash after wash. We’ve also designed it to stay in place without riding up, thanks to our smooth turn-back hem construction that avoids the need for tight, restrictive leg bindings.
Is alphx underwear good for hot weather?

Yes, our breathable cotton blend is enhanced with naturally antimicrobial modal to help wick moisture, reduce odor, and keep you cool and comfortable—even on your most active days.

Follow our latest trends & news on Instagram

Use hashtag #Alphx for your chance to be featured!

  • Man sitting on a motorcycle in a garage with various items in the background
  • Man wearing a white thong in a natural outdoor setting
  • Man wearing green underwear with text 'Stylish underwear is always in' and brand logo on a clear blue sky background.
  • Man lying on a yoga mat with a tattooed arm and green shorts.
  • Man in white underwear holding a red object in front of his face, standing in a doorway.
  • Man sitting with back to camera wearing black underwear on a beige background
Two men wearing olive green boxer briefs against a plain backgroundTwo men wearing olive green boxer briefs against a plain background

Ready for Underwear That Actually Fits?

Precision fit. Elevated comfort.

Modern Fit or Athletic Fit — your perfect pair starts here.

Once you wear ALPHX, everything else feels average.

FIND YOUR FIT