In all probability, when these fibres were made into clothing designed to keep bodies warm: yes.
Cotton can be grown in Egypt, thus linen garments can be made. Linen is much cooler to wear in the warm climate of Israel.
The quantity of linen bedding needed in the winter will depend on the other types of bedding that are used. For instance a duvet cover and an undersheet will be sufficient if a duvet is used, but you may choose to have a topsheet as well. Flanelette or brushed cotton will also keep you warm in cold weather.
whales keep warm by their blubber! good question
keep you warm
The fur on their bodies keep them warm.
They don't need to keep warm, they have a double coat so they stay warm.
In a blue linen closet
what keep you warm in alska
Does a stikleback keep itself warm? that is the question.
heat keep us warm :)
The materials keep you warm by the fabric they are made out of!