Trendy Apparel Shop Pi Math Symbol Two Tone Pom Striped Long Beanie Hat. 100% Acrylic . Two tone knit cuff long beanie hat for all winter outdoor activities such as snowboarding, skiing, camping, ice skating and others. A pom pom is accented on top of beanie . Thick, soft and warm material. Easily stretchable, ensuring a comfortable fit for most head types. One size fits most with flexibility.