All-Terrain Run Sock

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Overview

Ultra training on the weekend, after work lap on the valley trail or Wednesday night beer run, this running sock is designed to keep pace with whatever the intensity of your run.

Merino wool/nylon blend warms and dries, while naturally resisting odor during high-mileage days. Seamless toes minimize friction whether inside a zero-drop or double-thick-midsole shoe. Comfort compression and cushioned footbed reduce fatigue when pounding out uphills or burning up descents.

Materials

56% Merino Wool, 41% Nylon, 3% LYCRA® Spandex

Stewardship

Partnerships

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.

Materials

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.

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.