Layer well with the Helly Hansen Men's Warm Odin 1/2-Zip Top. This confluence of multiple materials features an HHDry ultra-wicking layer against your skin topped by a layer of warm, breathable merino wool for maximum comfort in extreme conditions. At the same time, a deep front zip and HHCool Grid Airflow ventilation prevents overheating when you're called upon to perform feats of aerobic intensity.