Carnation poron* insoles are 3mm thick and are easily adaptable and can be cut to any shoe size to help cushion and protect areas on the foot.
These insoles are non-adhesive but are easy to slide in and out of any shoe style easily.
*packaging does not state Poron material as this is a trademark name
For an adhesive alternative, check out out other listing of Hapla Poron 4000.