Our combination 13.5 All Season 3 In 1 Microfibre Duvet With Non Allergenic Hollowfibre Filling, Snug And Soft Touch Microfibre Cover.Our 3 In 1 duvet is the perfect answer to your all year duvet needs,combining the two will have you well wrapped up for the cold winter nights,as well as being able to use the two seperately using the 4.5 tog as a summer duvet or the 9.0 tog in the spring.Popping buttons on both duvets to connect the two together.