There are several factors to consider before purchasing custom orthotics. The casting technique used to create a mold of the foot should be appropriate for the individual's condition, such as a foam box or plaster cast for those unable to stand correctly. Custom orthotics can have rigid, semi-rigid, or soft flexibility depending on the medical issue being addressed. It is important to check the qualifications of the medical professional overseeing the process and prescribing the orthotics. Additionally, one should consider the finished size of the orthotics to determine if existing shoes can accommodate them or if new shoes must be purchased. A warranty is also important in case the orthotics need replacement or repair over time.