Erogdyne Chill-Its 6700CT Cooling Bandana with Cooling Towel advanced PVA material keeps you cool without the bulk. Advanced PVA material activates easily and quickly when run under water for one minute and is resuable! Just soak in water to re-activate. Evaporative cooling process keeps you cool all day, reduces the efects of heat stress and fights fatigue Lightweight and low profile is perfect for under hard hats. Tie Closure.