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Designed for wicking warmth in cold conditions, this baselayer delivers soft-on-skin comfort and exceptional thermal regulation thanks to its powerful merino fabric blend.

Peak performance starts at your base, and this crew is the perfect foundational layer when cold conditions call for extra warmth and exceptional breathability. The foundation of its unmatched performance and next-to-skin comfort is our proprietary PeakWool™ fabric, a powerful blend of soft yet resilient TENCEL™, nylon and elastane fibers with the warmth and wicking of 56% merino wool to deliver strength, comfort and range of motion for cold days on the mountain. 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
Fit and Measurements
  • Trim Fit: A slim design with minimal bulk that fits close to the body
  • Center Back Length: 26 3/4" (Size M)
  • Weight: 11.4 oz.
Other Details
  • Custom branded back neck tape
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How We Wear It

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