What layers in winter, wears on its own in spring, and dries quick all year round? The women's Burton Lightweight X Base Layer Crewneck, of course. It's the go-to garment for all your adventures. 221771. Built-in Climate ControlThe Living Lining® reacts to your body temperature, accelerating moisture wicking when you're hot and retaining warmth when you're cold for balanced comfort all day long. Stink Less Sustainable odor control keeps it fresh without limiting breathabilityComfy Fit and FeelChafe-free seams, four-way stretch, and a slim fit feel good no matter how hard you're working or lounging.Low Environmental Impact Bluesign® approved materials reduce impact on humans and the planet during manufacturing.