TruDefinition Duration COOL Shingles are specially designed to offer beautifully rich colors that reflect the sun's rays, helping to make homes more comfortable and energy efficient. The solar-reflecting granules help keep roofs cooler and may result in lower energy consumption and extended roof life. TruDefinition Duration COOL Shingles feature patented SureNail Technology to provide the same outstanding performance, durability and style you expect from any Duration Series Shingle, all while meeting the Cool Roof requirements.