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The Under Armour Heatgear Flyweight 5" Short is a great go-to training short for any runner's wardrobe. Perforated panels on back and sides increase breathability in key sweat zones, and front and side reflective details help you be seen in low light.


  • Black (001)


  • Approx. 4" inseam, 15.5" outseam (size medium) 
  • Perforated mesh for increased breathability in key sweat zones 
  • Elastic waistband with internal drawcord for a secure fit
  • Internal mesh liner to wick moisture and keep you dry and comfortable
  • Back envelope pocket to stow small essentials (Approx. 5"W x 4"H)
  • Front and side reflectivity for enhanced breathability in low-light settings


  • Main Body (100% Polyester), a lightweight fabric with perforations in key sweat zones to increase breathability
  • Liner (100% Polyester), a highly breathable mesh liner to keep you dry and comfortable

Apparel Performance Characteristics

Apparel Fit: What's this?

  • Compression
  • Fitted
  • Semi-Fitted
  • Relaxed

Temperature Range °F: What's this?

  • Cold
    • Below 30
  • Moderate
    • 30-45
    • 40-55
    • 50-65
  • Hot
    • above 65

Fabric Thickness: What's this?

  • Thin
  • Medium
  • Thick

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