In the 1970’s, prior to the adoption of the first ski boot sole standard, boot makers were free to concoct any sort of sole they might imagine. Many skiers still used leather boots with laminated soles, even after the industry largely moved on to injected plastic, which enabled shapes and sole patterns leather couldn’t duplicate.
This incoherent jumble of boot designs showed no lack of imagination, but little consideration for how they might interact with a binding. Bindings were likewise free from any standards that might have limited the creativity of their designs, many of which were crafted specifically to reduce or eliminate the role of the boot.