?? pins should be enough. Whip stitch across the top edge of the shoe to one side, moving toward the laces. It should start to take shape as a new shoe lining. Do not spray the lining fabric! Follow the instructions on the can. If you have a stock Vibram sole, outdoor companies will re sole your shoes for a small f.
Flip the liner over the edge of the shoe. It should start to take shape as a new shoe lining. You notice that it may pucker or drape oddly in places. Go back and fix your stitching at this phase. Some pucker is okay, and can be smoothed out later, but large wrinkles will cause blisters.
Gather the bottom edges of the liner, pin them together, and whip stitch them. This seam will go underneath the footbed to hold the fabric taut. It likely that this new liner will be more durable than the factory liner. Even if it isn you know how to fix it now.
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