Sweat activated super cooling meets a timeless trail piece. The Columbia Sportswear Mens Silver Ridge Zero Short Sleeve Shirt features a soft, wicking fabric in heathered earth tones with Omni Freeze ZERO technology for instant and prolonged cooling when youre working hard in the heat. Soft 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. Regular fit for comfortable range of motion. Center back length 29.