ESKIMOS knew the secret of using air as insulation. Their clothes consisted of two suits of pants and shirts, a hooded jacket and mittens.
Sometimes the suits were made of caribou skins - the lightest and most flexible skins of all the animals in their land. The suit closest to the body was worn with the fur next to the skin so that the hollow hairs could trap as much body heat as possible.
The suit on top was worn with the fur on the outside. This allowed another layer of air to be trapped between the two suits. Over it all, they wore a jacket, again with the fur on the outside. - bigsiteofamazingfacts.com; socialstudiesforkids. com; bluecorncomics.com