IKEA FJÄLLBRÄCKA duvet insert, which features a distinctive blue piping along the edges. Key Features Material: It is made of 100% cotton fabric and filled with duck down and feathers. Design: It has a box-stitched pattern to keep the filling evenly in place and provide an even temperature throughout the night. Care: The comforter is machine-washable at 140°F (60°C), a temperature that helps kill dust mites. Warmth Levels: The FJÄLLBRÄCKA line comes in different warmth levels, including "light warm"