Indoor sleeping bags, sometimes called '''slumber bags''', are widely available, often for use particularly by children. These are usually not designed to be weatherproof and are often made of natural fabrics instead of the synthetic fabrics commonly used for outdoor sleeping bags. Children's sleeping bags in particular often feature elaborate, brightly colored printed designs, such as images of popular media characters. Slumber bags make floor sleeping more comfortable, and are often used for [[sleepover]]s, family visits, and other situations where there are not enough beds for everyone.