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Built with a powerful merino fabric blend, this soft-on-skin half zip keeps you warm, dry and charging hard even when winter temps try to hold you back.

This essential baselayer is unlike any other when it comes to warmth and moisture management in cold conditions. The foundation of its peak performance and next-to-skin comfort is our proprietary PeakWool™ fabric, a powerful blend of soft yet resilient TENCEL™, nylon and elastane fibers combined with the warmth and wicking of merino wool to deliver strength, comfort and stretch for everything from cold lift laps to off-season trail runs. Flatlock seams minimize friction and thumbholes enable easy layering.

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 Image PeakWool™
PeakWool™, 56% Wool, 23% TENCEL™, 12% Recycled Nylon, 7% Nylon, 2% Spandex

PeakWool™ is a midweight fabric constructed with merino wool, TENCEL™, recycled nylon and spandex. The natural properties of merino regulate body temperature, keep odors at bay and manage moisture to keep you dry. The addition of synthetic fibers increases softness, adds strength and elevates its wicking properties. PeakWool excels in cold temps by keeping your core warm and dry, while enabling heat transfer when the tempo picks up.

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As caretakers of the mountain life, we recognize our responsibility to support organizations and people who share our vision to drive positive change for people and the planet. We’re proud to partner with some tremendous organizations in their missions to responsibly advance outdoor recreation and protect our wild surroundings.


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 and to completely eliminating PFAS from our garments by 2025.

Stio Second Turn®

Our apparel is built to last. As a part of our efforts to reduce waste and keep more gear in the mountains where it belongs, our home-grown gear renewal program allows previously-used items to be traded in, cleaned, repaired and circulated back into use.

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Fabric Details
  • A soft, moisture wicking merino blend that stretches, breathes, keeps its shape and resists odor
  • Flatlock seams maximize comfort and easy layering
  • Thumbholes for easy layering
  • Reverse coil zipper
Fit and Measurements
  • Trim Fit: A slim design with minimal bulk that fits close to the body
  • Center Back Length: 24 5/8" (size S)
  • Weight: 10.1 oz.
Other Details
  • Custom branded back neck tape
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How We Wear It