Commercial insoles: They can be off-the-shelf (OTS) items that offer just rudimentary support and correction. Typically, they have typical shock-absorbing and arch support qualities.
Materials: Polypropylene for structural support, different foams for comfort, and EVA for cushioning are common materials. These materials have been chosen because of their mechanical qualities, like durability and stiffness.
Materials for Orthotic Bases: The base layer of orthotics is typically made of thermoplastic polymers, such as EVA foam or polypropylene. These materials can be shaped to fit certain foot shapes and offer strength and flexibility.
Padding: To increase comfort, prefabricated padding materials like memory foam or gel inserts may be utilized.