Zoot Women's Ultra Tri Tank Coldblack - Sun Reflector. UV Protector. Zoot's dynamic triathlon textile is engineered to reflect sun rays, so even dark colors don't get hot. Dark colors, by nature absorb more visible and invisible light rays (i.e. heat) than lighter colors, making you hotter in the sun. When the sun's shining, coldblack technology is working double-duty to reflect UV rays and heat rays in dark apparel to keep athletes cooler in the hot sun. Coldblack technology keeps the fabric up to 9 degrees F cooler, making dark apparel act like light-colored apparel. Built-in bra features Dynamic X postural support Five back pockets for maximum nutrition storage 10" Reflective Cam Lock zipper with soft-finish zipper binding Dropped back hem for additional coverage