It's meant to be a quick and easy way to be protected from wind and coldness, if necessary. The shelter has the shape of a tube which has an adjustable length so one or two people can fit in it. The tube has a self-supporting design, this is due to a spiral of tubes filled with air. This fabric is coated with aluminum which will reflect the cold coming from the outside but it will keep and reflect instead some of the heat generated from the body inside the tube.
