We've solved the problem of being too cold when you start running or too hot when you get going. ColdGear® Reactor uses a unique structure to actually adapt to what you're doing so as you pick up speed, it dumps excess heat.
Fitted: Next-to-skin without the squeeze.
ColdGear® Reactor adapts to your activity level for the right breathability & warmth for what you're doing
Fabric has a unique hex-shaped pattern that traps a lot of warmth but still breathes as you run
Mesh side panels for strategic ventilation
4-way stretch construction moves better in every direction