PeakWool™ Single Jersey is a lightweight 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.

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. After years of research, testing and product development, in 2024 we completely removed PFAS from all of our newly developed products. We remain committed to growing our Preferred Materials usage, which includes organic cotton, recycled materials and responsibly-sourced down and wool, to 75% by the end of 2025.

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.

• Hybrid synthetic and merino blend moves moisture away from the body and dries quickly

• Flatlock seams maximize comfort and ease of layering
• Embossed brushed elastic waistband with Stio's motto to "Let The Outside In"
• Action gusset for range of motion

• Form-Fitting: A next-to-skin design that hugs the natural lines of the body
• Inseam: 28 1/2" (size S)
• Weight: 5.3 oz.

• Heat transfer interior labels for comfort
• Heat transfer Stio® and pinecone logos
• Made in Vietnam