The name says it all with this popular piece of headgear. More than just another beanie, the Tech Mesh incorporates a poly and spandex blend for a snug and comfortable fit. We then lined the beanie with a poly/carbon fabric that incorporates heat-regulating technology, woven directly into the yarn. The carbon fibers store unused body heat and release just when it's needed. The result is a beanie that keeps you warm but not overheated no matter the temperature or your activity.