SK-TEK Sleeping Bags, offer full 5-season insulation and is extremely efficient at keeping you warm. The high-quality silicone treated hollow fibre fill maintains its loft for maximum heat retention. A new hood design gives maximum versatility and allows enough movement for the bag to form around you no matter what your sleeping position. There is a fleece lined upper for warmth and a smooth polyester lined base for easy movement inside the bag with an additional smooth polyester stubble guard neck lining. The head and foot sections both have drawstrings that allow you to thicken the insulation and eliminate cold spots for a cosy nights sleep.