Sheraton Softiehk down is made of high-quality 90% duck down and is specially designed to suit Hong Kong's temperature. This quilt has high permeability and does not require too much down to achieve the thermal insulation function of 6-19 degrees. It also ensures that the down will not escape from the quilt cover. But if you switch to a 60% down quilt, you need to add 20% more down weight to achieve the same effect. If you want to know how warm this duvet is, flatten the duvet, and then gently lift it up to draw air into the duvet. You can clearly see in the picture that the grids are rising. The higher they rise, the more air there is and the warmer they are. If you want to know how high it is, you need to look at the seam looseness index, F/P500.
