Helsport X-TREM sleeping bags are designed for sleeping comfort in low temperatures and extreme conditions. Countless norwegian and international expeditions have documented their quality and functionality. Helsport 4sleep construction and Modular® insulation system is used, and our unique fiber/down® concept is found on a number of x-treM series sleeping bags. This combination reduces weight and packed volume while increasing warmth. Our X-TREM down sleeping bags are manufactured with high quality goose down, 90/10 mix with 700+ fill power.