Is there an insole to lift my foot when a wedge sandal is too loose?

I have a narrow, thin foot. These sandals want to slide off my foot when I am walking. It either causes me to twist my ankle or the shoe goes flying. I have two pair that do this. These shoes are fabulously comfortable except for this. The shoes are open all the way around except for straps (that do not adjust) across the top of my foot.

Is there an insole to lift my foot when a wedge sandal is too loose?

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