The Icebreaker Merino 260 Oasis Vertex Long-Sleeve Crewe is a 100% merino base layer built for winter layering. The fiber regulates temperature in both directions, holding warmth on a cold lift ride and releasing heat during an active push up a skin track, while staying naturally resistant to odor across a full day outside. A textured jacquard print across the body draws on the look of snow-covered mountain terrain. What Our Gearhead(R) Experts Are Saying:"The gusset construction is what I notice once I'm moving hard under a shell. It gives my shoulders room to reach without the fabric binding, and the flatlock seams stay flat against my skin the whole climb."