Winter is Coming! Wait... that's something else... sorry... But if you're a fan of Slytherin or have been placed in Slytherin during your visits to Pottermore and want to keep your noggin warm when it is chilly outside or you're playing Quidditch, this is the hat for you! Features Embroidered "Slytherin" in front and wide stripes in the Slytherin colors. Made of all new acrylic wool materials, One Size Fits Most (OSFM).