Slumberdown All Seasons 3-in-1 Double Duvet

The Slumberdown All Seasons 3-in-1 is the duvet that ends the twice-yearly loft swap: two duvets — a light 4.5 tog and a mid 9 tog — that popper together into a 13.5 tog winter quilt. Use the 4.5 alone in summer, the 9 in spring and autumn, and snap them together when the heating goes on. Both layers are filled with soft hollowfibre and cased in smooth polycotton, hypoallergenic throughout, which matters for the majority of us who react to dust mites in old bedding. The whole thing is machine washable at home — no dry-cleaning bills — and dries quickly thanks to the synthetic fill. With more than 11,000 Amazon reviews at 4.6 stars, it's one of the most-bought duvets in the country, and at £28.05 for a double it costs less than many single-season duvets. The poppers hold the layers cleanly aligned with no internal slipping, the classic failure of cheaper combination duvets. For guest rooms, first homes, student flats or anyone whose duvet decisions are currently seasonal arguments, it's the obvious, proven answer.