When your run takes you from shaded forest to alpine wind, the Senja Alpha90 Hood keeps your core temperature balanced without sacrificing breathability. This hybrid fleece is engineered to regulate heat and manage moisture in stop-and-go efforts or variable weather, making it ideal for high-intensity activities like trail running, fastpacking, or aerobic mountain travel.

• Breathable Warmth, Where It Counts
  The front and shoulders feature Polartec® Alpha90 insulation, delivering continuous warmth while actively releasing excess body heat—no need to remove layers when the pace picks up.

  • Polartec® Alpha90
    Revolutionary active insulation that balances warmth and air permeability. Ideal for high-output, cold-weather pursuits.

• Body-Mapped Design for Dynamic Output
  The back and underarms utilize Polartec® Power Grid™ fleece for mechanical wicking and ventilation. This grid-patterned fabric pulls moisture away while cutting down weight—ideal for high-sweat zones.

  • Polartec® Power Grid™
    Patented grid knit increases thermal efficiency and wicks moisture—while shedding bulk and weight.
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• Weather-Resistant Front Shell
  A 100% recycled 20D ripstop nylon overlays the Alpha insulation to buffer wind chill on exposed ridgelines and descents—without sacrificing packability or breathability.

Technical Details

• Weight: 302 g (Size L)

• Fit: Technical (trim silhouette with longer back hem for coverage)

• Materials:

  • Front & shoulders (face fabric): 100% recycled ripstop nylon, 49 g/m²

  • Insulation: 78% recycled / 22% polyester Polartec® Alpha90, 95 g/m²

  • Back & sides: 85% recycled polyester / 15% elastane Polartec® Power Grid™, 166 g/m²

Features

• Hybrid Construction – Wind-blocking Alpha insulation up front, breathable fleece at the back

• Close-Fitting Hood – Slim, stretch-fit hood designed to layer under a beanie or helmet

• Zippered Napoleon Pocket – Chest pocket for quick-access essentials

• Elastic Cuffs with Thumb Holes – For extra warmth and sleeve security while in motion

• Asymmetrical Hem – Dropped rear hem enhances coverage while running or bending

• Pre-Shaped Sleeves – Ergonomic design supports natural arm movement

• Reflective Details – Black reflex logo and print provide visibility in low light

• YKK® 4mm Zipper – Lightweight and reliable center zip for venting and layering ease