Stay warm through colder nights with this John Lewis Natural Duck Feather & Down Duvet. Super King size with a cosy 13.5 tog rating, it combines 85% duck feather with 15% duck down for comforting, weightier warmth. The piped 233 thread count 100% cotton cover is down-proof, breathable and treated with an antimicrobial finish to help keep the bedding fresher for longer.