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The Vortex Half-Zip is made for the alpine approach. Appropriate as either a cold weather base-layer or all-season mid-layer, the Vortex offers extreme adaptability in a lightweight package. Warm but breathable Polartec® Power Grid™ offers moisture-wicking insulation in a lightweight package. With reinforcements in high-abrasion areas for extended durability and sleek bicep pockets to keep essential gear close to hand, the Vortex is ready for an extended tour of duty in a range of environments.