"Flannel material" refers to a soft and warm fabric typically made from wool or cotton. It is often used to make cozy shirts or bedding that provide comfort and insulation. Full definition
For the winter babies, parents might want to choose the 100 % cotton flannel material that will keep babies warmer. (bestswaddleblanket.com)
It's a lightweight flannel material, so it's going to be nice to wear in winter too. (ladyinviolet.com)
When I received the replacement the fabric on the dress was reversed - fuzzy flannel material on the outside and smooth on the inside. (garnethill.com)