The Grow up Star is a cleverly designed summer sleeping bag for children and teenagers. At the foot section, Jack Wolfskin has incorporated an extension that can be pulled out via a zipper opening. It is extendable so that children and teenagers up to 160 cm in height can comfortably fit inside. The Grow up Star features a single-layer insulation that provides good heat retention in moderate temperatures. Additionally, it offers a compact pack size with a low overall weight. The foot area is additionally padded. The soft-touch 50D polyester outer cover is soft and durable. The 50D polyester taffeta fabric, both with and without grid embossing, is made from densely woven 100% polyester. It is a lightweight alternative to cotton or polycotton. This 100% polyester fabric is skin-friendly and quick-drying. Microfine fibers (MICRO) serve as heat storage, while stable spiral fibers (GUARD) provide stability and loft, thermally processed into a soft yet robust composite.