Q: What are insoles made of?
A: Insoles are made from varying densities of a plastic called ethylene vinyl acetate (EVA) which is a plastic that can be reinforced if necessary. The density changes depending on the amount of cushioning and support required, and can be split throughout any one insole. Higher density EVA will often be used towards the back of the foot, more support is generally required, and lower density EVA to the forefoot where more cushioning is needed.
We can also produce insoles from carbon fibre which are suited to more supportive orthoses, however carbon fibre cannot be manipulated once it has been milled out. While it provides excellent support, it is not always the most appropriate of materials.