A highly breathable, lightly insulated mid layer designed to manage vapour and temperature across a broad range of output levels and temperatures in order to minimize transitions. The hydrophobic Octa® Loft liner actively wicks moisture away from the body while the Fortius™ Air 50 fabric allows air into the system to move vapour out. Designed to keep you dry while providing thermal warmth and strong weather protection from a highly durable face fabric.