Columbia Women's Freeze Degree III Comfort S/S T-Shirt Polyester / Elastance Omni-Freeze ZERO sweat-activated super cooling Omni-Wick EVAP advanced evaporation Omni-Shade UPF 30 sun protection Antimicrobial treatment protects this product from bacterial growth Omni-Freeze ZERO Softie Strech Jersey 92% polyester / 8% elastane