This is a fleece cap from Nike ACG (Nike All Conditions Gear), Nike's outdoor line launched in 1989. It's the NIKE ACG fleece jet cap, a favorite of Koichiro Yamamoto, known for his "Stylist's Private Items" brand. I've used it a few times after purchasing it. Since it's a type without a core, it will be folded small for shipping. Color: Yellow Size: Free size, with adjuster Head circumference: 57-59cm Material: 100% Polyester