Thunderstorm is slightly darker than Stormy. Dyed onto 85% NZ merino with 15% silk content. Gorgeous silky soft yarn, with a lovely luster, and is suitable for any one with sensitive skin.Approx 100gms/400m hank.Recommended needle size 2.75mm - 3.25mm.Gentle machine washable. Pull garment back into shape, dry flat and in the shade.