Soak evaporating cooling vests in cold water and enjoy cooling relief and comfort. 100% nylon vests are lightweight, breathabke anddurable and feature a V-Neck with zipper closure, quilted nylon outer layer with an activated, polymer-embedded fabric inside. Water-repellent liner and black cotton-poly elastic trim enhance comfort. Soak in water 2-5 minutes to activate; reuse by re-soaking. Remains hydrated for up to 4 hours. Washable for repeated use.