Why are towels stuffer when you dry them on a clothesline than in a dryer?

I am lucky where I live I can dry my laundry outside most of the year and I do. I have noticed the towels are often kind of stiff when I do, but will not be on rare occasions I use the electric dryer. I use the same laundry products (which includes a fabric softener) but I have never used any drier products. ... show more I am lucky where I live I can dry my laundry outside most of the year and I do. I have noticed the towels are often kind of stiff when I do, but will not be on rare occasions I use the electric dryer. I use the same laundry products (which includes a fabric softener) but I have never used any drier products. This is only the bath towels, it does not happen with the kitchen towels. What causes this??? They are good quality towels.
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