A comforter is a bed cover stuffed with fibers or down for warmth and then sewn together on all four sides. Probably the most common bed topper in North America, comforters are available in a nearly endless range of colors, patterns, and styles and are a major decorative accent in the bedroom. Most are made of either cotton or polyester.

Lyocell is similar to viscose in that it is a regenerated cellulose fabric, but is made with a more eco-friendly process. TheU.S. Federal Trade Commissiondefines lyocell as rayons “composed of cellulose precipitated from an organic solution in which no substitution of the hydroxyl groups takes place and no chemical intermediates are formed” — essentially meaning it does not use the harmful chemical solvents normal viscoses use. Lyocell production also results in little waste product, but it is still relatively energy intensive.