Duvet Diva 5 "Amazing" Susan 06 February 2014 I have waited all my life for these! We have emporor sized duvets, and it used to take a very long time and enormous effort, pegging the duvet inside the cover all..the..way..round..the..edges, before much frantic shaking to get it in the right place! But now, it's simple. One Duvet Diva at each top corner, a couple of tugs and you're there! They aren't exactly cheap, but I would suggest 2 sets for super-king and upwards, to secure the top completely. Well worth the money. Absolutely brilliant!!!!