Terms of Reference

There's a lot of terms on our website which you may be unfamiliar with as they are seldom used outside the bedding industry. We try to define them as they come up in our articles and our duvet guide, but for quick reference here is a short glossary of terms related to duvets and down.


CUIN stands for Cubic Inch Per Ounce. It is one way to measure the fill power of down.

Down Cambric

A down-proof fabric (one that keeps the down inside) that can serve as ticking for a duvet. Cambric fabrics are light and closely woven.

Down Classes

The down class signifies the quality of down and, therefore, its suitability for being used as a duvet filler. At Downduvet.co.uk, all of our duvets are filled with top of the range Class I down. We only use 100% down or down with a maximum of 10% feathers.


Eiderdown is gathered by hand from eider duck nests at the end of the breeding season. Eider ducks live around the northern coasts of Europe, North America, and Eastern Siberia. Their breeding area spreads from the Arctic Circle, down to more clement zones such as Scandinavia, Northern England, Denmark, Iceland, and Eastern Greenland. Eiderdown is the most exclusive and sought after variety of down.

Fill Power

Fill power is a measure of a down’s elasticity and, therefore, indicates how well it retains air. The higher the fill power, the less weight in down you will need to keep you warm.

Mako Cambric

Mako cambric is a woven fabric made of Egyptian Mako cotton. Ticking made of Mako cambric is very light and airy.

Mako Satin

Mako satin is a fabric made of Egyptian Mako cotton and is woven with satin thread. This makes one side of the fabric (the outside of the ticking) feel very smooth.

Ne Value

We use a fixed-weight system to determine the quality of the ticking. The Ne (Number English or cotton count) value of a woven fabric indicates the delicacy of the thread. The yarn becomes finer as the count number increases. With an Ne value of 1, one pound of yarn would be 840 yards of long.


To ensure that no down escapes from the edge of the duvet, the ticking must be properly sealed. A decorative matt edging, a shiny decorative edging, or an elegant double seam can be used to accomplish this.


The ticking or cover of a duvet is the fabric containing the down. The ticking must be down-proof so that down cannot leak from the duvet. Ticking on a good down duvet is made mostly of woven cotton.

Please visit our frequently asked questions to learn more.