I am sure the treated down is a bit more expensive, but when looking at jackets that have the technology added they are not that much more expensive than they were without it added. The reason I think it is interesting is if I have to use the top quilt on the ground. It is likely to get a bit wet and I won\t have that much time to dry it out. Normally, wet down is a bear to dry. The treated down is supposed to take significantly less time to dry out even when soaked.