Dr Cool Chillband Studio Women&rsquo;s Cooling Headband 88% Polyester 12% Spandex, Hypoallergenic and chemical-free Metallic logo heatseal, comfort elastic back at nape of neck for perfect fit. 4 wide at front Coolcores cooling technology is built right into the fibers, the cooling performance not only lasts for the life of the garment, it even improves with several washes. Dr. Cool uses a patented chemical-free cooling material, designed by Coolcore, to keep you cooler and more comfortable during any activity. Rather than a simple wicking technology Coolcores material delivers three distinct functions  wicking, moisture circulation, and regulated evaporation  to reduce the fabrics surface temperature by up to 30%.