This mummy sleeping bag is made of high quality hollow cotton, made of waterproof 210T polyester tartan. The main 

advantage of this winter sleeping bag is that it can be stitched into a double sleeping bag. So whether you're out camping 

with friends or family, this sleeping bag is your best bet.

  This sleeping bag is very thick and warm, and has good waterproof effect and is suitable for cold winter outdoor camping.

  The use of sleeping bags is particularly important

  Try not to allow too much space between the inside of your sleeping bag and your body. The more space you have, the 

more heat your body needs to produce. The gap between your sleeping bag and your body can be filled with clothes you 

need to wear the next day, not only to reduce the amount of energy your body needs for heat, but also to provide warm 

clothing to wear the next morning.
  Before using the sleeping bag should make it fully fluffy, so that the heat preservation effect is better. If your budget is limited 

and you don't want to buy a bag with too many grams, you can double up with two regular bags. Don't sleep with your face 

in the bag because there is only one consequence: the moisture from breathing will condense on the bag and reduce its insulation.
  Tips: after each use, keep the warm air out of the bag to avoid moisture condensation.