I recently came up with the pattern and I think it's quite like being barefoot!
Step 1: Measuring
Rip another piece of duct tape the same length an place it on top of the first one.
Then measure how wide your foot is from where your toes are and add an inch and a half.
Keep adding strips for how long your foot is and when you have enough strips to create the width.
Do the step again so you have it for both feet.
Step 2: Rounding
Step 3: Adding Straps
Fold the piece of duct tape so it's like a strip that you would see on a regular flip flop.
Make three more the same length (2 for the other flip flop and one more for the first one.)
Tape them onto the flip flop one goes over your four smallest toes and the other one goes over your big-toe.
Step 4: Attaching Straps
Attach so it goes over your four outermost toes.
Do it again on the right flip flop but do it mirror.
Step 5: Attaching Last Straps
And your done!
Step 6: Adjustments
Also you might have to lengthen the flip flops so your big-toe has some more room.