The glitter material is quite resistant.
Nevertheless care is key! Before you wear your shoes, spray them with a strong hold hairspray. Once the spray has thoroughly dried, add another layer or two. In a similar way to other shoe protectors, this helps create a protective layer and reduces the flaking of the glitter pieces.
You must take out the protection film on the soles before wearing the shoes and only when you are sure you are not going to request a reimbursement.