Mid-layer designed for the ALPINE CHALLENGE series. SERAK stands
out from normal fleece thanks to the use of the innovative POLARTEC® POWER AIR™.
Inside each single cell there is a polyester yarn (100% recycled) encapsulated
creating an air bag that acts as a thermal insulator. The result is a fabric
with a soft touch and high insulating qualities at low dimensions and high
elasticity. SERAK is equipped with KETRATEX stretch insets on shoulders and
elbows that provide resistance in the most stressful areas, allowing you to use
it externally even in mild temperatures.