Sleeping Bags and Pillows
Synthetic bags, however good, don't last as long as a down bag, but they are much better if damp, as a rule of thumb they may lose 1 degree of warmth a year.. A good down bag may last 20 year when well looked after. Some modern down sleeping bags have hydrophobic down and are much warmer when wet/damp than traditional down. The outer material on some bags is water resistant.
Even the thinnest of silk sleeping bag liners will make you much warmer and keep the bag cleaner. We also carry replacement bags and waterproof bags to keep your bag dry when the weather is really bad.
To care for your bag keep it clean (follow the manufacturers recommendations for cleaning when needed), use a liner if you can and keep it dry.
A sleeping bag is only as good as the mat you lie on, as the bag is compressed beneath you and you will lose a lot of heat downwards. Conventional air beds are cold, so a mat or other insulation is needed below you. The warmest backpacking mats are the Exped down mats.