Carhartt WIP Stratus Hat Low in Boxwood. Knit from an acrylic yarn in a stretchy ribbed stitch construction, the Stratus Hat Low from Carhartt delivers in comfort and warmth perfect for those colder months. Here arriving in a slightly shorter style to sit neatly above the ear. Pairing effortlessly with the rest of the Carharrt range, this piece makes a perfect accessory for your outfits this season.