The Spark sleeping bag is the perfect option for lightweight adventures that puts comfort at the forefront.The optimal warmth to weight ratio and 850+ FILL Power makes this bag as comfortable as it is compact and easily packable.MaterialsGoose Down with Ultra Dry Down treatment for improved water resistance in damp conditions.10 Denier Nylon and 10D Nylon, these lightweight fabrics offer breathability, protection and effective temperature regulation for premium comfort.FeaturesMummy Fit: Fitted cut with generous footbox and technical hood, to maximise thermal efficiency and minimise bulk and weight.1/2 length zip with zip-plow and two sliders.Vertical chest baffles, horizontal baffles lower half and base. Box wall baffles top half of bag and sewn through quilted construction lower half.Standard front draft collar.Technical fitted hood with soft touch adjustment. Extra deep for cosy like feel.Single, down-filled, draft tube along the top of all zippers.Long length.Temperature RatingsComfort: 4°CLower Limit: -1°C Sea To Summit Spark -1C Down Sleeping Bag - Long