Pearl Izumi's Transfer Lite Headband has one job: to keep your brow dry and your eyes sweat-free. Its active technology toward this end is Pearl's Minerale fabric treatment, which incorporates crushed volcanic rock into the material's synthetic fibers. This makes the yarn porous for a structure with more surface area, allowing moisture to pass more easily through it to the fabric's surface. It keeps you dry, and it also eliminates the opportunity for moisture-loving bacteria to build up odors. The headband is finished with reflective elements to help keep you visible in low-light conditions.