NightComfort all-season duvets do it all. Nightcomforts exclusive All Seasons quilt is prepared to suit your sleeping needs for the entire year. To create the perfect all-season duvet, we started with a soft microfibre cover and filled it with a hollowfibre filling made from pure optic polyester fibre, Combining the two together creates a warm and cozy 13.5 Tog duvet that is perfect for colder, winter months.