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Incredibly light, yet also reliably warm, the Mizuno Breath Thermo Windtop is a half-zip high-tech piece that is a must-have for cold weather runs. Breath Thermo® fibers, strategically placed, change body moisture to heat so that you can have lasting dryness and warmth on frigid days.  A small side zip pocket provides ample media storage while thumbholes at cuffs help to keep heat in.


  • Black/Lime (904i)


  • Approx. 8" zipper with reflective piping and zipper garage
  • 1.5" mock neck
  • Double layer chest and shoulders: Windproof shell and strategic Breath Thermo® fibers provide a lightweight shield with core warmth
  • Reflective Mizuno logo and accents
  • Extended sleeves, tapered cuffs, and thumholes
  • Back zipper pouch (4" zipper, 4"W x 4"H)
  • Breath Thermo® lined back with stretch fabric and higher air circulation


  • Shell Exterior: (100% Polyester), a windproof, lightweight fabric shell
  • Breath Thermo®: Inserts (87% Polyester/13% Polyacrylate), a unique fiber woven fabric that generates heat in reaction to body moisture
  • Side Panels (86% Polyester/14% Polyacrylate), a moisture-wicking, soft fabric that has moisture-activated fibers that provide heat

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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