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Quick-draw, breathable warmth for grinding out miles in frosty weather or gaining vertical at sunrise. The highly aerobic, highly efficient vest warms yet allows airflow with 40 grams of PeakFill™ Active Insulation.

Morning fitness gets frigid as the weather turns, but our Fernos Vest provides measured, breathable warmth to keep grinding out miles in frosty weather or gaining vertical as the winter sun rises. The highly aerobic, highly efficient vest warms with 40 grams of PeakFill™ Active, a synthetic circular filament fill that warms when wet and lofts back quickly when pulled from a pack. The sleek silhouette slides easily over a stretch fleece or wicking top, yet still layers smoothly under a rain shell, soft shell or ski shell.

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 Image Relance™ Primeflex
 Image PeakFill™ Active Insulation
Shell and Lining

Relance™ Primeflex, 50 Denier Microfiber Mechanical Stretch Plainweave, 100% Polyester,  85g/m2 with 80/20 DWR finish

Relance™ Primeflex 100% polyester microfiber offers better drape and wicking than that of normal polyester fibers. This fabric features a soft hand, comfortable stretch, wind resistance, and excellent resiliency and strength.


PeakFill™ Active Insulation, 57% Polyester, 43% Recycled Polyester, 40g/m2

Our PeakFill™ Active proprietary insulation balances warmth and breathability to maintain lasting athletic comfort across the entire conditional range. Designed to keep core temps regulated, the synthetic fiber fill draws on a spiral filament structure to enable greater stretch, faster recovery and quicker dry times than traditional lofted insulation whether rolling slow at valley level or working hard up in the alpine.

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Climate Neutral

We completely offset the footprint of each order through our commitment to being climate neutral. As part of our mission we value being good caretakers of the mountain life and protecting the places where we play.


We are committed to building garments that are durable, timeless and continue to perform season after season. Over 50% of our product line incorporates preferred materials, which include organic cotton, recycled materials and responsibly-sourced down. We are committed to growing our preferred materials usage to 75% by 2025.

Trade-In Program

We believe a circular commerce system will design out waste and pollution, allowing for used clothing to be renewed and put back into use. Stio Second Turn™️ is our gear renewal program that allows customers to trade in and shop used apparel.

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Fabric Details
  • PeakFill™ Active insulated layer
  • Microfiber shell and lining with soft hand and mechanical stretch
  • YKK® center front zipper with custom Stio® zipper puller
  • YKK® zipped hand pockets to secure essentials
Weight and Measurements
  • Weight: 7.3 oz.
  • Center Back Length: 24 3/4" (size S)
Other Details
  • Heat transfer Stio® and Pinecone logos
  • Imported
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