This category includes many down filled sleeping bags as well as some synthetic and some mixes. Down filled sleeping bags can be compressed down much smaller and weigh less than standard synthetic filled sleeping bags typically. They have a higher loft to weight ratio, simply meaning for the same amount of down filling, synthetic filling would be much less insulating. The fact the down filling can insulate much better, less filling needs to be used, therefore making a much more compact and lightweight sleeping bag. This is ideal when doing extreme hiking, trekking, mountaineering as you don’t want to be weighed down or for your backpack to be too bulky. We also offer synthetic alternatives as you will find these much cheaper and are ideal for one time trips or adventurers on a budget. Find 2-5 season rated sleeping bags within this range for all destinations, climates and durations. Our 2-3 season sleeping bags are perfect for extreme adventures abroad in warmer countries and destinations, whereas 4 and 5 season sleeping bags can be used for mountaineering when the high altitude makes it very cold.