Perfect for customers wanting a luxurious 13.5 Tog Duvet that regulates their temperature to its optimum throughout the night. Smartfil is even lighter than the highest quality fillings. The tiny micro fine smartfil fibres make for a softer duvet that drapes perfectly around the body trapping 30% more air than ordinary fibres, offering warmth comfort and breathability. Available in 4 sizes: Single, Double, King Size and Superking