Thank you, Joseph. Thank you Sonya. Your explanations are very informative. Basically that's what I wanted to know. :)))

Some Americans use a "comforter" to stay warm in bed. Comforters are usually colorful and are filled with cotton or polyester. Comforters can be washed in a washing machine. Other Americans use a "duvet" to stay warm in bed. A duvet is plain white and is often filled with duck feathers or goose feathers; other duvets are filled with materials like polyester. Then people buy a colorful duvet cover -- the duvet goes inside the duvet cover the way a pillow goes including side a pillowcase. A duvet cover is thin, like a sheet, and can be washed in the washing machine without having to wash the big duvet. Thank you for sharing the video -- it was interesting to watch.

Are you referring to what type of blanket people sleep with? There isn’t one type of blanket used. There’s probably hundreds of types people use throughout the country. Plenty of states have very warm winters also so some people rarely use blankets at all. Most people turn their heaters on anyway so you don’t really need a blanket. Most people sleep under a “comforter” which is normally a large, thick cotton blanket.