Columbia Cool Rules 1/2 Zip There's no need to feel dirty, wet or uncomfortable in any way while roughing it with the Columbia Women's Cool Rules 1/2 Zip top because it comes with built-in Omni-Wick technology that repels dirt grime and moisture to allow you to be victorious over the elements. The top comes installed with an advanced and technological Omni-Freeze system that regulates your body temperature to keep you comparably cooler in warmer temperatures. The fabric is composed of 95% polyester and 5% elastane Freezer Deluxe fabric that stretches and snaps back into shape quickly for enhanced mobility. Also installed in the top is Omni-Shade UPF 30 sun protection that keeps your skin safe from the detrimental effects of dangerous UV rays while you are exposed in the outdoors. The top is both comfortable and stylish with a form fitting and flattering cut that accentuates your natural curves and provides the appearance of a slimmer waistline.