An emblem of unwavering bravery. Crafted from a substantial 300 GSM warm wool-like acrylic, this classic Gryffindor house sweater features a precise 3/1.5 needle knit and a refined ribbed finish for uncompromising everyday comfort and warmth.Technical Specifications. The Slytherin Sweater is an extraordinary, high-quality knit pullover designed for devoted fans of the magical universe.