Jack Wolfskin Storm Lock Cap 100% Polyester Made in USA or Imported Weather the storm with the Stormlock Cap from Jack Wolfskin&reg;. Tough polyester construction. Embroidered brand logo at the front. 100% polyester. Machine wash cold, lay flat dry. Imported. Measurements: Circumference: 22 in Product measurements were taken using size LG. Please note that measurements may vary by size.