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A soft-on-skin baselayer tight crafted with a moisture-wicking merino blend to keep you warm, dry and charging hard in cold conditions.

When it's cold enough for icicles to form on your beard, but the promise of first tracks is too strong, the Basis Midweight Merino Tight delivers elevated performance and thermoregulating properties to keep you warm and dry throughout. The secret to its comfort and warmth 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.

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 Image 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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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
  • A soft, moisture wicking merino blend that stretches, breathes, keeps its shape and resists odor
  • Front fly
  • Athletic design ideal for aerobic activity
  • Flatlock seams maximize comfort and easy layering
  • Gusset
Weight and Measurements
  • Weight: 8.5 oz.
  • Inseam: 28 1/4"
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How We Wear It