This is an Evaporative Cooling Product (ECP). Just submerge in cool water for several minutes, blot dry and wear! Fabric retains hydration keeping you cool for hours.

Comfortable, quilted nylon outer with polymer embedded fabric inner, water-repellant nylon liner, black cotton-poly elastic trim, and hook & loop attachments Replacement liner attaches to Baseball Caps using hook & loop. Provides 5-10 hours of cooling relief per soaking; lightweight, durable and washable. For Evaporative Cooling Baseball Caps HS3019.