A double-shade sweater features a design that blends or contrasts two distinct colors, creating a visually appealing gradient or pattern. This sweater might have a smooth transition between two shades of the same color, like a light and dark blue, or it could pair two contrasting colors, such as black and white or red and grey. The shades can be arranged horizontally, vertically, or diagonally, and may include additional design elements like color blocks, stripes, or ombre effects. The fabric is usually soft and cozy, ideal for cooler weather, with a mix of wool, cotton, or acrylic for comfort and warmth.