The Spark -1C sleeping bag from Sea to Summit is a robust and highly technical sleeping bag. The sleeping bag is super lightweight yet offers excellent warmth. With a comfort temperature of 4°C, it is ideal for chilly summer nights. The down has a temperature-regulating effect and also has an excellent ability to make up for excessively warm temperatures. The sleeping bag can be packed down to a volume of 2 liters and therefore hardly takes up any space in a rucksack. The Spark -1C really comes into its own on long trekking adventures where weight and pack size are important. Weighing just 493g at 185cm tall, it is super light. The down is treated with a pfc-free water-repellency treatment and works even if the sleeping bag has absorbed some moisture from condensation. The 10D polyamide is robust and makes it possible for you to sleep directly under the open sky.