If you are looking for a warm yet breathable beanie that will keep you warm while allowing the excess heat to escape, then the Ascendant Beanie is the one for you. 
 
Fabric: Pertex® Microlight 100% nylon 20D ripstop stretch woven shell, Polartec® Alpha® Direct Insulation 100% polyester 95 g/m2, Radiant Fleece™ 95% polyester, 5% spandex earband 
 
Features: insulated, breathable, moisture wicking, water and wind resistant, stretchable, compressible, quick drying