The Patagonia Capilene Midweight Crew is constructed out of moisture-wicking, quick drying performance fabric that features Polygiene permanent odor control. All fabric is bluesign approved. Slim Fit - Midweight Baselayer, Polartec Power Grid -100% Polyester w/Polygiene Permanent Odor Control, Fair Trade Certified Sewing, Fabric is Certified as bluesign Approved, Fit: Tight, Warranty: Lifetime, Material: Synthetic, Weight: Mid, Type: Top, Recommended Use: Snow, Antimicrobial: Yes, Anti Odor: Yes, Quick Drying: Yes, Moisture Wicking: Yes, Model Year: 2019, Product ID: 496054, Model Number: 44436 BLK S, GTIN: 0190696345155