Insta-Snow is a synthetic polymer with super water-absorbing properties that enable the powder to expand 100 times its original size. Evaporation produces the constant cooling effect that makes the faux snow feel cold. Gradually evaporation also causes the snow to dehydrate. Spraying the top with water and fluffing the snow will restore its fresh, fluffy appearance or let the snow dry out completely and store for reuse later. The dry powder lasts forever.