Since dryers smash and pummel fibers enough to keep them soft, you really don't need fabric softener to soften them. (Try it if you don't believe me.) What you do need, if you just have to use a dryer, is something to cut static cling so you won't lose your socks inside your trouser legs. Crumple a piece of aluminum foil - used and washed is good - and place in the dryer with your laundry. That's it. It works.