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Find the fit and size that's best for you

Use our customized fit finder quiz or scroll down for size charts

Two Options for a Better Fit: Athletic vs. Modern


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Our fit is contemporary, cut slimmer through the seat and thighs and is meant to sit on or right below your hipbone.

For a more relaxed fit consider sizing up. Please consult our size charts below and feel free to reach out to Garrett and Tom for recommendations or questions at no annoying chat bots here, one of us will respond to you within 24 hours.

We understand that one size doesn’t fit all when it comes to men's thighs. ALPHX introduces two exclusive leg width options, allowing you to customize your fit.

Slimmer waist with bigger thighs? No problem. We’ve got your back. Choose your unique combination of waist and thigh size and revolutionize your underwear game.

  • Our MDRN Fit sits just below your natural waist and has a slimmer contemporary leg fit. With 6% elastane for ease of movement, our MDRN Fit is perfect for guys with slim to average thighs. Available in incredibly comfortable boxer briefs, union pants, and trunks in sizes XS-XXL. (25-inches to 45-inches)

  • We added an additional half-inch to the diameter of our MDRN Fit to create our ATHLTC Fit. It's great for guys with large or muscular thighs. Available in Trunk and Boxer Brief styles in sizes S to XL.(28-inches to 40 inches)

Check out our size guide for actual measurements, or take our consult our sizing grids below based upon common body characteristics.


The most comfortable underwear in sizes XS-XXL

The ALPHX size charts