The Seirus Heatwave Thick N Thin Headliner is made ready for adventures. Crafted for explorers who love roaming throughout the winter, this headliner has an exclusive thermodynamic lining with a 4-way stretch hood and cozy, 200wt technical fleece neck warmer. Heatwave technology allows this headpiece to reflect the heat of your body, amplifying warmth and transforming a lightweight Headliner into an amazingly warm piece of gear. With a thin skull and thick neck section, you get amazing warmth capacity out of a piece that also fits comfortably under helmets or hats. Feel comfortable exploring throughout the winter while wearing the Seirus Heatwave Thick N Thin Headliner.