Could I stick these inside my shoes to keep my foot from sliding around in my shoes when I walk?

You're going to have to be more specific than just "shoes". What knd of shoes? Pumps, loafers, sneakers...what? Reason being, some types would be solved by thicker socks or laces - possibly even a smaller size.

How many total sq feet of product?

These are tiny and was surprised when I received it. If you put them all back to back and arranged it would be equivelant to a half of a square foot approximately

Non-Abrasive Grip Kit

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