Engineered for muscular thighs and glutes.
No compression. No riding up. Just performance comfort.

Bundle Your Bundle in Seconds

  • Choose Your Bundle

    Pick any 3 (save 20%) or any 5 (save 25%)

  • Mix or Match

    Boxer briefs, trunks, briefs, or union pants
    Any colors. Any combo.

  • Instant Savings

    Discount applies automatically at checkout

  •  

    Save 20% When You Build 3

    Start with your everyday essentials or try new styles.

    Build a 3-Pack
  •  

    Save 25% When You Build 5

    Maximum value. Build your full weekly rotation.

    Build a 5-Pack

Why Choose Athletic Fit?

  • Designed specifically for muscular thighs and glutes
  • More room where you need it — support where it matters
  • No leg squeeze
  • No riding up
  • No waistband rollover
  • Built to move with your body
  • Breathable performance fabric
  • Stays cool, dry, and supported all day
  • A clean, athletic silhouette under clothing

Not sure which fit is right?
Use the Fit Quiz or explore Fit Authority below.

Find Your Fit Fit Authority Best for Muscular Thighs

Available in Your Bundle

  • ALPHX Athletic Fit Boxer Briefs – Maritime Navy - ALPHX.com - Underwear

    Boxer Briefs

  • ALPHX Athletic Fit Trunks –Midnight Black Support & Comfort Redefined - ALPHX.com - Underwear

    Trunks

    .

  • ALPHX Athletic Fit Union Pants Frost White: Room to Move, Comfort to Last - ALPHX.com - Underwear

    Union Pants

Mix styles or stay with one. Your bundle, your way.

Build Your Bundle Now

Bundle 3 for 20% or 5 for 25%
Your fit. Your colors. Your comfort.

Build a 3-Pack
Build a 5-Pack

Athletic Fit Underwear Bundles Built for Muscular Thighs

Looking for premium men’s underwear bundles designed for larger legs? ALPHX Athletic Fit is engineered for muscular thighs and glutes with extra room through the leg and a secure, stay-put fit. Build your bundle and save when you choose any 3 pairs for 20% off or any 5 pairs for 25% off.

Choose from boxer briefs, trunks, briefs, and union pants crafted from breathable, moisture-wicking fabric that stays smooth under clothing. Each piece is designed to reduce leg squeeze, prevent riding up, and deliver supportive comfort all day.

Mix colors, styles, and sizes to create your perfect bundle — underwear built to move with your body and fit athletic legs without compromise.