Perfect for customers wanting a duvet which can be washed at home. Four Seasons: 4.5 Tog and 9 Tog Duvets that can be used independently or can be buttoned/poppered together to make a 13.5 tog for the winter months. 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