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What Our Gearhead(R) Experts Are Saying:"The Boundless Trek Tech Jacket is my go-to for cool-weather hikes. It's lightweight but warm, with just the right stretch to move comfortably."The Columbia Boundless Trek Tech Full-Zip Jacket keeps us cozy and comfortable on brisk mornings and cool trail adventures. Designed with lightweight, stretchy fabric, this jacket moves with us as we navigate rocky terrain or enjoy a walk in the woods.