All-day warmth, year-round versatility. The Skyliner All-Season Base Layer Crewneck adapts to your adventures, from below-freezing to 50+. Lightweight, breathable, four-way stretch fabric ensures a flexible fit while moisture-wicking, odor-fighting properties keep you fresh. Shred, hike, or bike all day with the lightweight warmth and superior moisture-wicking power of the Skyliner series.