Needing arch supports...help

[EustacuaVye]

I have flat feet and wear omni 11 trainers which have arch supports but they don't seem to be enough as I can feel where I am running on Tarmac that I am running flat footed and it is giving my shin splints.

Can anyone tell me where I can get some supportive insoles?

[Realfoodieclub Graduate]

I know boots do quite a few different ones. My other half has special ones that were made for him but that was through a podiatrist years ago. Hope you find a resolution.