Your kids grow with every adventure they go on and so does the size-adjustable GROW UP KIDS sleeping bag. Hidden in the foot section is a zip that allows you to extend the bag by 40cm, making it suitable for children up to 140cm. The bag features TEXATHERM CORE synthetic fibre insulation. The big advantage of this material is that it is insensitive to moisture, so it retains its thermal performance even when damp. A double layer of insulation in the foot box keeps sensitive little feet warm and cosy. Jack Wolfskin Grow Up Kids Sleeping Bag