This Slumberdown Cosy Nights All Seasons Combi 15 Tog (10.5 + 4.5 Tog) Duvet is made up of two separate duvets that conveniently fasten together and come apart, depending on your needs. Use the lightweight 4.5 tog duvet for keeping cool on warm summer nights, or use the 10.5 tog duvet during transitional months when you require a more versatile, mid-weight duvet. You then have the option to combine the two, using the simple and secure press-stud fastenings, to create a super snuggly 15 tog winter duvet to ensure you stay warm and toasty the coldest of nights. The cosy hollowfibre filling is wonderfully comfortable, and the soft touch cover feels perfect to snuggle up into, creating a combination single duvet that gently wraps around your body so you can be comfortable and still move freely through the night.