The particularly warm Extreme Hiker is designed to keep you well tempered and comfortable whilst hiking or travelling in the colder months of the year. While this is the most popular bag for school, snow and camping expeditions, it also popular amongst the winter hikers. The synthetic filling doesn't absorb any odours and maintains a great loft fostered by the double layered insulation. Hi-Country Lite Hiker Extreme -10 Sleeping Bag