Model A4

Built for all day comfort. A semiflexible orthosis that provides both support and accommodation.


  • Comfortable walking design
  • Mild control of midtarsal joints
  • Rearfoot control
  • Accommodative support
  • Premium, Medical Grade, Subortholene Shell


The Subo-Flex is designed for low-impact activities, such as walking, and for patients who spend long periods of time on their feet. It’s primarily a supportive device, but its subortholene shell also provides some accommodation. The shell provides semi-flexible support while molding to the contours of the patient’s foot over time.

EVA arch fill provides additional stability, rigidity, and shock absorption, making this device the perfect hybrid of functional correction and cushioned support. This device also provides substantial rearfoot control with a firm, crepe, extrinsic post. It is covered with Spenco top cover, a Myolite extension, and a full-length suede bottom cover. This device has been designed to fit in most work and walking shoes with removable insoles.

The Subo-Flex is constructed with a positive model of the patient’s foot and can be modified at the practitioner’s discretion.

Tech Specs


  • 3mm Fat Pad Expansion
  • 3mm Lower Medial Arch
  • 10mm Heel Cup


  • MOD: 0 (Modify casts to Balance Forefoot perpendicular to Rearfoot)
  • RF: 0 (0° Extrinsic Rearfoot Post)
  • FF1: N (Forefoot Neutral: Not Posted)
  • FF2:      (None: Splitting forefoot post partial intrinsic and partial extrinsic)
  • HL: 0mm (No Heel Lift)


  • Subortholene Shell Calibrated per Weight
  • Blue EVA Arch Filler
  • Black Crepe Rearfoot Post


  • Finish Standard
  • Black Heel Plate


  • 1.5mm Myolite Extension to Toes
  • 1.5mm Black Spenco Top Cover to Toes
  • Black Suede Bottom Cover to Toes


Top Cover Options

  • Glove Leather
  • Micro Suede
  • Plastazote
  • Spenco
  • Vinyl
  • Prolite

Bottom Cover Options

  • Glove Leather
  • Micro Suede
  • Vinyl

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Recommended For

  • Walking and work shoes with removable insoles
  • Fast relief from biomechanical pathologies

Clinical Indications

  • Overpronation
  • Lower extremity pathology
  • Poor posture

Customized Devices

Full details and images from custom devices that have been built for actual patients

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