Left (I believe) is a discontinued pascal Dr. Martens, right is Solovair derby. I am trying to find something similar to the left one: more streamlined, wraps naturally around the foot whereas the right one expands outwards and looks like a clumpy boat.
Not the hardest spanking I've had but been but over my boyfriends knee spanked with a slipper and been told off like a naughty girl almost made me cum.