Dancer's padding was introduced by the French studying ballet injuries in the 1700s. It has a modern term of "Reverse Morton's Extensions". The current supplier for my patients is Amazon, and I can only find the 1/4 inch which you will have to thin out.
I use this material constantly in my Podiatry practice, and give supplies to my patients. Any problem with the big toe joint, and some cases of plantar fasciitis, and arch pain, you want to see if this padding helps the symptoms. 
This is demonstrating the Dr Jills Dancer's Padding with Adhesive Gel
