HDPE (High Density Polyethylene) is a thermoplastic that is molded with ease making it an excellent support in functional custom foot orthotics and bracing. HDPE is an effective and less costly substitute to subortholene. It is also a preferred replacement to extra-firm foams. Available in sheets, blanks, pre-molded blockers and pre-made shells. Size, rigidity, and thickness all vary according to your needs.