From Columbia’s site: Omni-Wick™ keeps you dry and cool by pulling moisture to the fabric’s surface to evaporate, delivering fast-drying, next-to skin comfort in the heat Omni-Freeze™ helps you feel cool and dry with accelerated wicking and next-to-skin comfort in moderate to hot conditions Omni-Shade™ Broad Spectrum UPF 50 protects against skin damage using select fibers and fabrics to block a wider range of UVA/UVB rays, so you stay safer in the sun Just-right stretch for ease of movement Binding at neck and arms for a finished look Empire waist with an A-line silhouette for comfort