A blanket is a type of bedding, generally speaking, a large piece of woven cloth, intended to keep the user warm, especially while sleeping or lying down.
Blankets are distinguished from bed sheets by their thickness and purpose. Blankets are thicker; even the thinnest blanket is thicker than the heaviest sheet. Blankets are generally used for warmth and comfort, while sheets are for hygiene, comfort and aesthetics. Blankets were traditionally made of wool because of wool's warmth, breathability and natural fire-retardant properties, while sheets were made of cotton or linen or silk, which are less irritating to the skin. Nowadays, synthetic fibers are frequently used for both.