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Fast-drying, it's our top pick for vigorous aerobic activities or for camping and travel. Antimicrobial Polartec Power Dry polyester is double-plaited to wick sweat away from your skin, while the pill-resistant exterior quickly disperses it, keeping you warm, dry and comfortable. Flatlock seams give you a smooth fit. Midweight fabric is our most versatile weight for warmth during a range of activities and temperatures. Imported. Machine wash and dry.