Behind the Product Winter Base Layer Top. Midweight synthetic comfort with odor control, quick-drying performance, and a built-in neck warmer. If go-to versatility is what you seek, the men&';s Burton Midweight Long Neck Shirt balances warmth, breathability, and quick-drying performance with built-in climate control that you can count on all season. And when the weather has harsher plans, the neck extends to become a built-in neck warmer. Product Features Made to Move Fit Slim fit with four-way stretch keeps it comfy and lets you move naturally. Built-in Climate Control Midweight 200 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. The sustainable odor control of HeiQ Fresh keeps it fresh without limiting breathability. Low Environmental Impact BluesignA(R) approved materials reduce impact on humans and the planet during manufacturing. Tech Specs Fit Slim Fit Fabric DRYRIDE Ultrawick Midweight Baselayer [92% Recycled Polyester, 8% Spandex] Double Side Peached using HeiQ odor control technologies, Front Neck Piecing DRYRIDE Ultrawick Lightweight Birds-Eye Baselayer [100% Recycled Polyester] Features + Tech Quick-Drying and Highly Breathable Stretch 360Adeg For Unlimited Mobility Chafe-Free Softlock Seams for Comfort Thumbholes Imported Yes Warranty Lifetime Warranty