ZANheadgear® s Cooldanna® offers hours of cooling relief for hot conditions after the safe non-toxic cooling crystals are activated with water. Features Keep your cool when it s hot outside made from h&-washable 100% cotton May contain excess dye for a deep/rich color, so pre-washing before each use is recommended Non-toxic reusable polymer crystals produce a cooling effect Soak in water for 10 minutes, then tie around neck or head Bag included for on-the-go use