What are comforters made out of?

Comforter Construction:

Filling- Comforters are filled with layers of material such as polyester batting, down feathers, wool, or silk. The loft of the filling determines the weight as well as the level of insulation. The comforter is stitched or quilted to secure the filling and keep it evenly distributed. Dean Miller Surf Bedding uses a 12oz polyester batting fill, with a channel or diamond stitching to keep your comforter looking like it just came off the store rack.

Tropical Shell/Covering- The outer shells of comforters are typically constructed using cotton, silk, or polyester fabrics or blends, of varying thread counts. Comforter shells vary in design and color, often designed to coordinate with other bedding. Dean Miller's beach bedding uses 100% cotton outer shell or covering to give the user a super soft night's sleep. Dean Miller's Hawaiian print fabrics are usually 200 thread count, but we have been known to use even higher thread count in some of our surfboard sheet sets.