Get cold jobs done in comfort with the Carhartt® Acrylic Knit Hat for Men. Warm 100% acrylic rib knit insulates your head and ears from biting frigid temperatures, keeping you focused on the task at hand. The Carhartt Acrylic Knit beanie for men can be worn comfortably under a hard hat, hood, or ear protection, so you can stay both warm and protected. One size fits most. Imported.