Featuring ergonomic seams and a sweat wicking stretch construction, the richly heathered Columbia Sportswear Womens Tuk Mountain Short Sleeve Shirt is built to help you hike a little farther and run a little longer. During long hours under the sun, the Tuk Mountain tech tee shields you from harmful UV rays with UPF 50. Richly heathered 88% polyester, 12% elastane fabric. Omni Wick pulls moisture away from the body and enables perspiration to evaporate quickly, keeping you dry and comfortable. Omni Shade UPF 50 sun protection blocks Ultraviolet A and Ultraviolet B rays UVA and UVB, helping to prevent sunburn and long term skin damage. Comfort stretch. Center back length 27. Regular fit for comfortable range of motion.