Black GI Military Gore-Tex Waterproof Wool Knit Watch Cap - USA Made Features a double knit 100% wool material with a Gore-Tex layer. Durably waterproof - liquid water doesn't penetrate in Gore-Tex membrane, so your head stays drier in wet weather Genuine Government GI Product. Made in the USA Gore-Tex membrane - strong, durable, and resistant to water & wind penetration. Offers all weather protection for almost all conditions. Very breathable to insure you won't sweat while wearing.