Winter duvet: Get extra cosy with a winter duvet. Super bounce: 100% superfine hollow fibre filling. Sizes: Choose Single, Double, King or Super King. Made in the UK: Made in the UK and fully conforming to British standards. 15 tog: Ideal for the colder months. Features: Extra soft and hypoallergenic – the perfect duvet for a great night’s sleep. Machine washable: Machine washable, and can be tumble dried on a low heat setting.