A cornerstone of the FILSON brand, and essential to any discussion of their products, is their signature material, "Mackinaw Wool." This is characterized by its 24-ounce heavyweight 100% virgin wool. The "Double Mackinaw Cap" is a winter classic made using this Mackinaw Wool. The cap features a nylon lining on the inside, genuine sheepskin earflaps, and more. Originally designed with functionality in extreme conditions in mind, it's a FILSON masterpiece that also boasts a design suitable for everyday wear. ■ Product Name: 11060041 DOUBLE MACKINAW WOOL HAT ■ Made in the USA ■ Size: M (Head circumference approx. 58cm) ■ Material: 100% Virgin Wool ■ Color: Charcoal Grey ■ Details: Sheepskin earflaps, quilted lining - Color: Dark Gray - Design: Earflap cap - Features: With fur - Style: Flight cap Thank you for viewing.