Boot sole glue?

I had a pair of Redwings resoled twice, what a beautiful boot, used to wear them as my regular shoe as well, lasted for years .
They stopped making that style, and I never found another style as comfy.

I know my dad has had a set of red-wings re-soled multiple times, I remember the first time was in the mid-80's he loves those old boots, he still wears them.