The duvet is the first in their collection to feature a button-on attachment. This attachment is a quarter of the size of the entire duvet and, using the buttonholes and buttons, can be attached in four different positions: at the top, at the bottom and in between. The attachment is available separately and as part of a set with a Royal All Seasons Duvet. It retains heat just like any All Season Duvet - so can be used with all Royal All Season Duvets (from 2017 onwards) featuring the corresponding buttonholes. The attachment helps you tailor your duvet exactly to your own requirements, whether you feel the cold on your shoulders, feet or anywhere in between. Royal Vario is the first of its kind in the world, and the patent is pending.