Designed for superior moisture wicking performance, the Pearl Izumi Women's Transfer Base Layer keeps you cool and dry on the hottest rides of the year. Its P. R. O. Transfer Dry fabric uses 37. 5 Minerale polyester formerly known as Cocona for enhanced moisture wicking and evaporation. This technology embeds active carbon particles into the base layer's polyester, increasing surface area to speed up evaporation of built up sweat. Ultimately, this means you'll feel cooler and drier when you're hammering up hills and sprinting down country roads under the mid summer sun.