More than just a base layer, it's a four-season shirt with breathability for staying on the move. Winter layer, for sure. Spring breathability, absolutely. Quick-drying for summer fun, you bet. The men's Burton Lightweight X Base Layer Crewneck brings breathability and comfy stretch to adventures big and small. It's the base-layer shirt you can wear to hit the hill, go for a hike, or just wear under your hoodie 'cause it feels good. Features: Built-in Climate ControlThe Living Lining® regulates temperature as your body warms up without adding weight or bulk. Comfy Fit and FeelChafe-free seams, four-way stretch, and a slim fit feel good no matter how hard you're working or lounging. Stink LessonBluesign® approved anti-odor finish keeps the stink away. Low Environmental ImpactBluesign® approved materials reduce the impact on humans and the planet during manufacturing. Burton Men's Lightweight X Base Layer Crewneck - True Black