Cotton casings are by far the most popular form of casing for a modern day silk duvet. Cotton casings are available in various grades but it is important to consider thread count when making a purchase. Generally the higher the thread count, the finer the stitch and the better wearing the duvet will be. Anything over 240 thread count should be fine. Anything under and one should question the quality and continued durability. Quality of casing is often directly related to price.
There is almost an endless choice for duvet casings. Cotton, silk, polyester etc.. Traditionally the Chinese used a very course threaded casing for their silk duvets. This was to allow body heat to escape through the casing and help in heat regulation. Today, largely due to modern manufacturing techniques a much tighter and finer casing can be woven which has similar properties. The choice of silk casing is largely down to individual preference, however there are a few points to consider.
As of yet there is no official British Standards tog rating for silk duvets. This leaves the market in a bit of turmoil as some suppliers may recommend one thing, and others something completely different. The comparative tog rating system we have seen is by measuring grams of silk per square meter. A duvet filled with 250gsm silk will be the equivalent of a 2-4 tog. A duvet filled with 400gsm will be the equivalent of a 7-9 tog, and a duvet filled with 600gsm will be the equivalent tog a 10-13 tog. It is worth pointing out that many suppliers offer a “combination duvet” which is a 250 and 400gsm duvet that fasten together. There are some good deals to be had when a discount is offered for the purchase of a combination set. For a good deal on combination duvets take a look at a company called ellesilk. www.ellesilk.com
There are so many varieties of silk duvet available today; it’s not always easy to decide which one to buy.
Knowing what is in your silk duvet is essential if you want a duvet that will perform as it should. From the outset let’s be clear. Long-fibre mulberry silk is what you should be looking for in your duvet. Most other forms of silk will just not be as good as long-fibre mulberry silk. Long-fibre mulberry silk does however come with a caveat. It’s expensive, but then you get what you pay for. Cheap silk duvets are almost always filled with a mix of polyester and silk, or chopped strand silk which is essentially off cuts of silk that can’t be used for anything else. Any good silk duvet will have a small inspection zip where one can inspect the quality of silk inside the duvet. If your duvet doesn’t have an inspection zip you need to be asking the question… “What’s inside my duvet?”