Hello, Thanks for your interest in Spirit Shop. We carry different brands and sizing may vary by brand. Each garment has its own size chart with product measurements from the manufacturer. We recommend you measure a hoodie you already own for comparison and then choose whatever size most closely matches those measurements. To measure, lay the hoodie on a flat surface and measure across the front from seam to seam about 1" below the arm hole. Length is measurement from the highest point of the shoulder near the neckline down to bottom hem.