Main Terms of Reference

We can talk forever and a day about down duvets – we’ll be pleased to! On this page you can find all the main terms of reference.


CUIN stands for Cubic Inch Per Ounce, a measure for the fill power of down.

Down Cambric

A down-proof fabric (one that does not allow any down to escape through it) and therefore can serve as ticking for a duvet.

Down Classes

The down class signifies the quality of down and therefore its suitability for being used as a duvet filler. At, our duvets are all 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. The Eider duck lives around the northern coasts of Europe, Northern America and Eastern Siberia. The breeding area spreads from the Arctic Circle down to more clement zones such as Scandinavia, Northern England, Denmark, Iceland and Eastern Greenland.

Fill Power

Fill power is the measure of the 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 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. The Ne value is determined by number of hanks of 840 yards/lb. At a value of Ne 1, in one pound of yarn weight, there are 840 yards of yarn length.


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

Thermal Class

The thermal class of a duvet indicates the degree of warmth the duvet provides. Thermal class 4 is cool and extends to class 1, warm. We also stock extra warm duvets. WinterPlus is suitable for very cold circumstances, or for those who very easily feel the cold. Click here for more information about differences within thermal classes.


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

Please visit our frequently asked questions.