Columbia Freeze Degree II Polo Shirt 92% polyester, 8% spandex, 92% polyester, 8% spandex (back) Omni-Freeze ZERO perspiration-activated cooling technology lowers the temperature of the fabric for instant and prolonged cooling Omni-Wick EVAP rapidly disperses moisture across a broad surface for accelerated evaporation Omni-Shade UPF 50 sun protection blocks damaging UV rays Smooth, lightweight fabric is antimicrobial Zip neck