G.B.
The dryer forces air through the fibers and the smell dissipates. It is natural. They still have a bit of the fragrance left but you may not be able to smell it due to your nose being used to smelling the scent when it is the strongest.
I get lots of compliments on the smell of my clothes, I often get asked what kind of perfume I am wearing and I don't wear any, it is the laundry soap, Gain Original, and the fabric softener, Downy with the green lid, and then I use Bounce Free with no fragrances or other additives.