Duvets have been in use for long in Germany and in the Netherlands many years before it made its way to England. Paul Rycaut, an English traveler in 1700, was impressed by the duvet, and tried to pass his enthusiasm to his friends. However, it did not become popular in his home country until the 1800s. King size duvets make any bed warm, no matter the cold of winter. Here's a guide to buying one today.