White duck down filling material, comfortable and keep warm.Down is fluffy, sleeping bag is light, but it's warm.

Down is very soft and light. There is a small gap between down and down, which causes the air convection in the sleeping bag to be bad. It can form a layer of insulation layer which is isolated from the outside, so that the outside cold air is not easy to reach the inside, and the inside hot air is not easy to reach the outside, so that the temperature can be maintained.
Use zipper of international famous brand.
Durable taffeta shell that will stand up to years rigorous use.
Use waterproof fabric, light rain is no problem, of course, it is not recommended to get wet when it rains.
Innovative Footbox Design-Footbox is vaulted so you have even more roon for your feet.
Package include:
1 * Down Sleeping Bag
1 * Storage Sack
Specifications:

Shell Fabric:320T Nylon
Filling material:90% White duck down
Size:210cm*80cm (Loose place)*50cm (Narrow place)
Sleeping bag weight 1300g, The weight of filled down is 800g,Comfort temperature:-5-10 degree centigrade, Limit temperature: -10 degree centigrade, packing size 22*25cm
Sleeping bag weight 1500g, The weight of filled down is 1000g,Comfort temperature: -10-5 degree centigrade, Limit temperature: -15 degree centigrade, packing size 24*27cm
Sleeping bag weight 1700g, The weight of filled down is 1200g,Comfort temperature:-15-0 degree centigrade, Limit temperature: -20 degree centigrade, packing size 26*29cm

Goose down's warm keeping principle:
Down is very soft amd small, Although it looks thin,when you sleep in the sleeping bag,the down will attract your body temperature, so that the down will expand, isolate the cold air from the outside, and achieve the effect of warmth retention.
It looks thin when the temperature is low,after attracts your heat,It will thicken when the temperature is high, which is normal.