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.