Catalyst Cryohelmet Adult Migraine Relief Cap Neoprene, proprietary UltraCool synthetic fabric Made in the USA and Imported UltraCool fabric is moisture wicking and dries quickly. Insulating neoprene shell (contains no natural rubber  latex free). All parts are machine washable, line dry. CryoMAX is reusable. Recharge in household freezer overnight Features adjustable straps for better fit and better thermal transfer.