Elevated Essentials. Perfect Fit.
Your everyday underwear shouldn’t feel average. ALPHX blends custom sizing with sustainable comfort to create underwear that fits your body—and your lifestyle.
See what makes ALPHX different.
Find the Fit That Works for You
Most underwear brands treat size as one-size-fits-all. At ALPHX, we offer six waist sizes and two thigh widths—so your underwear fits your body, not just your label.
Whether you have slim legs or powerful quads, you'll find a fit that stays put, supports where it should, and feels made just for you.
One Style- Two Leg Fits
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ALPHX Modern Fit
Explore modern fitOur Modern Fit offers a sleek, slimmer cut that sits just below the waist, with tailored legs for slim to average thighs—designed for a secure, stay-put fit.
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ALPHX Athletic Fit
explore athletic fitOur Athletic Fit provides the same contemporary fit as the Modern with extra legroom for men with larger or muscular thighs—delivering a secure, stay-put fit with added comfort.
The ALPHX Lineup
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Briefs
SHOP ALPHX BRIEFSSleek & Supportive: Lower rise and contoured pouch, no back seam. Modern Fit
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Trunks
SHOP ALPHX TRUNKSSupport Without Bulk: 2" inseam with gusset support—perfect under shorts. Modern or Athletic Fit.
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Boxer Briefs
SHOP ALPHX BOXER BRIEFSSecure Fit, No Ride-Up: 4.5" inseam, breathable stretch, Modern or Athletic Fit.
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Loungewear
SHOP ALPHX union pantsVersatile Comfort: From couch to errands—made to move with you. Modern or Athletic Fit.
Eco-Friendly Comfort That Performs
At ALPHX, sustainability starts with what touches your skin. Our fabrics are made from 94% plant-based fibers that offer next-level softness, breathability, and stretch—without compromising the planet.
Our Promise to you
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Personalized Fit
Underwear engineered for a more personal fit, providing six waist sizes with options tailored for slim, average, and muscular thighs.
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Engineerd for Comfort
Our products are made from soft, breathable cotton, naturally antimicrobial modal, and a hint of elastane for stretch, offering lasting comfort and durability for everyday wear.
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Environmentally Conscious
Crafted with care from 96% plant-based premium fibers, ethically sourced and responsibly manufactured. Shipped in minimalist, biodegradable packaging, ALPHX lets you feel great about your purchase—inside and out.
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Thousands of positive reviews
We love hearing stories from our customers praising the comfort, fit, and quality of our underwear.
Bundle & Save on ALPHX Essentials
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Modern Fit Bundles
Shop Modern Fit BundlesDesigned for slim to average thighs, our Modern Fit gives a streamlined feel without sacrificing comfort.
Save 20% when you buy 3. Save 25% when you buy 5.
Mix briefs, trunks, and boxer briefs in any size or color—it’s your bundle, your way. -
Athletic Fit Bundles
Shop Athletic Fit BundlesMade for muscular thighs, our Athletic Fit offers more room in the leg without riding up or squeezing tight.
Save 20% when you buy 3. Save 25% when you buy 5.
Bundle across styles, sizes, and colors—built to move with you.
Real Customer Reviews | Honest Feedback You Can Trust
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.
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Ready to Upgrade Your Underwear?
ALPHX is engineered for real bodies with custom sizing, breathable fabrics, and no-ride-up comfort. Whether you’re looking for a better fit, better feel, or a better planet—we’ve got you covered.