The Downright Cascada Peak duvet insert is available in sizes of Twin, Full, Queen, Oversized Queen, Supreme Queen, King, Oversized King, and Supreme King. The Downright Cascada Peak duvet insert is the perfect alternative to provide warmth and comfort and is made of 100-percent cotton cambric, features a 300 thread count and is filled with 600+ white down. This duvet insert is a white down hypoallergenic comforter and is lightweight making it one of the most desired fills for a duvet or comforter. Down also has the amazing ability to breathe, lifting moisture away from the sleeper. Far less down is needed in weight than other fillings, which means a much lighter, but warmer product.