Check out the new outdoor gear from BlueZone Sports. The Jack Wolfskin ATMOSPHERE PANTS will keep you warm on rest breaks during winter walks, or on freezing cold nights in a tent. They are filled with high performance duck down. The down fill ensures you stay warm even when you're not moving about as much. The trousers are also incredibly light. At the areas that are more exposed to wear and tear (lower legs, knees and seat), we have used our robust MICROGUARD ECOSPHERE synthetic fiber insulation. The thermal performance of this insulation material is not compromised by compression or moisture. When you no longer need the extra warmth, simply stuff the trousers in their pack bag and drop the neat little bundle into your rucksack.