Columbia shortsleeve shirt Womens Cool Rules S/S Top white The Omni-Shade technology also embedded in the shirt helps to shield your skin from harmful UV rays that can often be oppressive and detrimental to the skin's health during frequent outdoor exposure. The Omni-Wick technology installed in this useful shirt disperses uncomfortable sweat build-up and shields the skin from exposure to excessive rainwater that is likely to be an obstacle in the unpredictable outdoors. With 95% polyester and 5% elastane Freezer Deluxe fabrics, this shirt provides you with an attractive form-fitting cut that allows for maximum mobility and agility in every demanding outdoor obstacle. The Columbia Women's Cool Rules Short Sleeve Shirt comes embedded with specialized Omni-Freeze technology that keeps your body significantly cooler during long and demanding outdoor activities such as hiking and jogging. The subtle ventilation systems built all around strategic areas of the shirt allow the most commonly overheated areas of the body to have maximum breathing room and air circulation to regulate body temperature and increase endurance throughout all outdoor activities.