When you are hiking, trekking and travelling and carrying everything on your back then weight and packed size are very important. Down is the most efficient insulator gram for gram and that is why we use it in our new Hiker series sleeping bags. Available in three warmth options and tested to the international ISO23537:2016 standard for sleeping bag temperature ratings. They are filled with responsibly sourced 700+ loft water repellant down the Hiker has a contoured hood for cold nights and zips open completely for versatility in warmer weather. ISO testing means that the comfort rating of this bag is far more accurate than alternative ratings, meaning you can trust the bag to keep you toasty warm!