To meet the demands of high-output cold weather activities, 230gsm Polartec® Power Grid™ provides the ultimate mid layer: Grid-like structure provides loft for maximum warmth, as well as excellent air permeability and wicking to facilitate moisture transport, all in a lightweight package. Micro ripstop at chest and shoulders provides extra protection from wind, light precipitation, and backpack straps, plus a zippered chest pocket to keep essentials at hand.