Flat feet can be a painful condition and finding the perfect insole can be extremely difficult. The ideal treatment is to see a Podiatrist and have them make an orthotic specifically for your foot.
But if you do not have the insurance coverage or the $400 for a Podiatrist to create an orthotic for you, then what orthotics out there can you try?
As a runner with flat foot the biggest mistake you could make is to choose an insole with a high arch. All a high arch will do is exacerbate the pain you are feeling. It will cause your arch to fatigue and take away shock abosrbtion during heel strike.
So what is a good orthotic to wear for a runner with flat feet? I recommend the 10 Seconds Flat Foot Insoles
This orthotic is specifically made for feet with low arches, it provides heel to toe pronation control. This orthotic is also made to accommodate most athletic shoes. It uses a Poron Urethane layer in the orthotic for cushioning. This will support your foot from mid stance to toe off. For an orthotic for runners with flat feet I recommend this orthotic: