Why Thigh Fit Matters
Most underwear brands ignore one of the biggest differences in men's bodies—thigh size. ALPHX doesn’t. Our unique fit system combines two thigh fits—Modern and Athletic—with six waist sizes to give you a truly personal fit.
Your Fit. Your Size. Your Comfort.
-
Modern Fit: For slim to average thighs
Shop Modern FitALPHX Modern Fit underwear is tailored for guys with slim to average thighs who want a clean, streamlined look without squeezing or riding up. Enjoy a perfect balance of comfort, contour, and movement—all day long.
-
Athletic Fit: For large or muscular thighs
shop athletic fitBuilt for men with muscular or larger thighs, our Athletic Fit underwear eliminates tight leg pinch and ride-up. Designed to move with you, not against you—so you can focus on your day, not your discomfort.
-
Sizes from 25" to 45" waist (XS–XXL)
Find Your SizeOur inclusive sizing spans XS to XXL, covering waist sizes from 25" to 45". Whether you’re lean, built, or in between, ALPHX has a fit made for you—because better comfort starts with better sizing.
Made Better—For You and the Planet
- ✅ Ethically Manufactured
- 🌱 96% Plant-Based Fabric
- 📦 Biodegradable Packaging
- ♻️ Offset Shipping Carbon
Engineered for Everyday Comfort
- 🏷️ Tag-Free Tear-Away Labels
- 🩲 Contoured Pouch Support
- 🧵 Seam-Free "No Wedgie" Back
- 🧪 Naturally Antimicrobial
Don't take our word for it. Here is what our customers are saying:
Shop by Fit
-
MODERN FIT
shop modern fitTailored Comfort for Slim to Average Thighs
ThighsPrefer a sleek, contoured fit without extra bulk? ALPHX Modern Fit underwear is made for men with slim to average thighs, offering all-day comfort with soft stretch, support, and zero ride-up. The perfect everyday essential.
-
ATHLETIC FIT
shop athletic fitBuilt for Muscular or Larger Thighs.
Tired of tight leg openings and uncomfortable squeeze? Our Athletic Fit is designed for men with muscular or larger thighs—offering more room where it counts, with a no-pinch leg, contoured pouch, and seam-free comfort.
