What Our Gearhead(R) Experts Are Saying:"I've worn the Merino 260 Tech Half-Zip on hut trips, resort days, and cold-weather hikes-it's my go-to base layer when the temps drop. The merino fabric is warm, breathable, and doesn't stink, even after days of use. I really like the gusseted underarms and shoulder seams that don't interfere with backpack straps. It runs a bit roomy, so I size down for a snug fit under my shell."We count on the Icebreaker Merino 260 Tech Long-Sleeve 1/2-Zip Top for full days outside when warmth, comfort, and breathability are non-negotiable. Built from heavyweight merino wool, this baselayer keeps us warm in frigid temps while still regulating heat when our pace picks up. Whether we're skinning up to a ridgeline or heading into the backcountry for a multi-day trip, this piece helps manage moisture, reduce odor, and maintain comfort from start to finish. Icebreaker equips this layer with smart construction details that make a big difference. Offset shoulder seams reduce friction under pack straps, flatlock seams eliminate chafing, and gusseted underarms let us move freely. The zip neck lets us vent heat quickly on the uphill, and the regular fit offers just enough room for layering over or under. When our winter layering system needs serious reliability, this piece earns its place every time.