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You will still need a pair of shoes when wearing your prosthesis. Make sure you bring your left shoe when you are being fit for your prosthesis so it can be adjusted for that pair of shoes

Sockets are made by a certified prosthetist who uses a cast, 3D scan, or measurements (or a combination) to make a mold of the patient's residual limb. That mold is then modified to reduce pressure where it isn't wanted (bony areas) and increase pressure where it is wanted (fleshy areas). Prosthetists use test sockets, which are usually clear plastic so you can see through it and heat it to change the shape, to make sure the socket fits well before making the final socket (which is usually laminated using materials like carbon fiber, nyglass, and acrylic resin).