A sleep sack is a wearable blanket designed to keep infants and toddlers warm while they sleep. It typically features armholes or is sleeveless, allowing for freedom of movement while providing a cozy environment. Sleep sacks come in various materials and thicknesses, making them suitable for different temperatures and seasons. These products are often used as a safer alternative to traditional blankets, reducing the risk of suffocation or overheating. Many sleep sacks are adjustable, allowing them to grow with the child, and they can be found in various sizes and designs to suit individual preferences.