Many people know that down comforters and sleeping bags are of the highest quality, but few know why. There are two basic types of feather for all birds. The vaned feathers are the outer layer, while down feathers are underneath. Unlike vaned feathers, down ones don’t have barbicels (a series of branch-like attachments), giving them their light, fluffy consistency.
The soft nature of down feathers makes them ideal for comfy jackets, pillows, comforters and sleeping bags. The down feathers on birds are also crucial in keeping the bird warm and providing winter protection. Because of this, a goose down sleeping bag is not only soft, but also provides superior insulation.