Because on the trail as in life, its best to stay cool, Columbia built their tried and true Womens Silver Ridge Long Sleeve Shirt with sweat activated super cooling technology. Its also wonderfully stretchy, with sweat wicking performance to keep you comfortable and dry. 80% polyester, 20% cotton fabric. Omni Freeze ZERO reacts with your sweat to lower the temperature of the material, so you feel cooler. Omni Wick pulls moisture away from the body and enables perspiration to evaporate quickly, keeping you dry and comfortable. Comfort stretch. Regular fit for comfortable range of motion. Center back length 26.5.