Unit
Heavy-build athletic performance — an entirely rigid frame with a unitized polypropylene rearfoot post, built congruent to the foot for complete rearfoot control in patients over 250 lbs.
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Built for heavy loads and complete rearfoot control.
The Unit shares the versatility of the Classic Sport but adds increased support — a great option for active patients weighing more than 250 pounds who need rearfoot control from a unitized extrinsic post. Its entirely rigid frame recalls the once-popular Rohadur style of orthotic.
Complete control, no compression. A polypropylene unitized rearfoot post delivers full functional control without the give of a crepe post — built congruent to the patient's own foot model, not an average.
Shoes with removable insoles
A rigid, supportive build best seated in footwear with a removable sock liner.
Patients over 250 lbs
Increased support and an entirely rigid frame handle higher loads without losing rearfoot control.
Active & sports-injury patients
Complete functional rearfoot control from a unitized polypropylene post suits active patients managing sport-related conditions.
Functional correction, congruent to the foot.
Built from a positive model of the patient's foot and modifiable at the clinician's discretion — scanned and ordered through FootID Pro.
Shape is everything.
What separates Root from generic insoles is the precise morphological shape captured from the patient's foot — held in the exact clinical position the clinician chose. No averaging. No guesswork.
The Unit is built from a positive model of the patient's foot and can be modified at the practitioner's discretion. This means every device fits the patient it was made for — not an approximation.
Modern Root
Width adjusted considering both borders. Default for all Root models.
Traditional Root
Justified to the lateral border. Used for specific clinical indications at practitioner discretion.
Modern Root shape process
- Forefoot balanced to rearfoot — forefoot-to-rearfoot relationship is optimised as the first step in shape modification.
- Fat pad expanded ~3mm — ensures the device fills the calcaneal contour precisely for the patient's heel.
- Arch lowered ~3mm — creates optimal heel-to-arch-to-met-head geometry. Not applied to foam impressions.
- Width tuned to both borders — medial and lateral widths considered together, giving a foundation that matches the patient's actual foot width.
*Subtalar joint neutral is found by palpating the talus head against the navicular. The neutral position can present many joint-on-joint and bone-on-bone relationships and varies from person to person. An everted or inverted calcaneus may be a neutral position for an individual person. Biomechanical evaluation required.
How you hold the foot is what we build.
Root is not just the orthotic — it's the clinician's positioning, captured and preserved in the device. After scanning, FootID Pro asks the questions no other lab asks.
After every scan, we need to know:
- Was the subtalar joint held in neutral?
- Was the midtarsal joint maximally pronated — loading the 5th metatarsal head?
- Was the midtarsal joint maximally supinated — loading the 1st metatarsal head?
- Was the forefoot brought perpendicular to the rearfoot?
- Was a forefoot-to-rearfoot balance bisection achieved at 90° relative to the calcaneal bisection?
The positioning of those 19 joints in the foot is what gives us the shape.
CAD/CAM fabrication
- Scan or cast captured — clinician captures foot morphology via FootID Pro, holding the subtalar joint in the chosen clinical position.
- Shape modification applied — forefoot balanced to rearfoot, fat pad expanded, arch adjusted using Root's design process.
- Technical staff review — every device reviewed against Traditional Root, Modern Root, Blake Inverted, or Accommodative principles.
- Fabricated to the shape — the polypropylene frame and EVA post are fabricated to match the submitted shape precisely.
See how the scan becomes an order.
Watch Kevin capture a foot, confirm the clinical position, and send a Root order — start to finish.
Variation converted to anatomy-match accuracy by impression & fabrication method
How closely each method preserves the patient’s intended foot shape. Scale: 0–100%, where 100% = optimal congruence.
Plaster bandage is wrapped around the foot in the clinician’s prescribed corrected position, setting into a precise negative of the foot’s contour.
The foot is pressed into a crushable foam box, leaving a negative impression of the plantar surface.
An existing positive model from the patient’s previous orthotics is reused — KevinRoot accepts models from any lab, with frame-contour variance as low as 1%.
A digital scanner such as FootID Pro captures the foot surface as a 3D model.
A fiberglass casting sock is applied over the foot and cures to capture its contour.
Pedobarography captures the patient’s plantar pressure distribution (static or dynamic) at 1:1 scale — used with arch height and shoe size to select a redimold positive model, not to capture true 3D contour.
A direct-molding system using prefabricated, size- and arch-based positive models (33 in total) rather than an individual foot impression.
Heated material is vacuum-pressed over a plaster positive model, drawing it intimately into every contour.
The frame is 3D printed by selective laser sintering (SLS) directly from the CAD-designed digital frame.
A positive model is CNC-milled (CAD/CAM) from an STS, 3D scan, plaster, or foam impression, then the frame is vacuum formed over it.
A CNC machine subtractively mills the frame from a block of polypropylene or EVA per the digital design.
*Redimold has no physical or digital foot impression — patient-foot-to-cast congruent accuracy is unavailable. Variation from positive model to frame is low.
How your patient's foot shape becomes a precision frame.
The journey from clinical capture to finished Unit frame is where Root's expertise lives. Every step preserves the shape and position the clinician chose for that patient.
- Foot impression captured — the clinician captures the foot using their preferred method. How the foot is held directly determines the congruency of the finished device.
- Positive model created — the impression becomes a physical plaster model or a digital CAD/CAM model. Digital models are stored indefinitely for future pairs.
- Root technicians modify the shape — every modification reviewed against the prescription. Rearfoot post, heel cup depth, and cover selection confirmed per patient.
- Unit frame fabricated — an entirely rigid polypropylene frame is vacuum formed over the positive model with a unitized polypropylene rearfoot post for complete functional control. A Protex top cover is applied (or omitted for water-shoe use), forefoot balanced to rearfoot.
FitFoot360 Foot Model
- Root digital model stored indefinitely → recalled for future pairs
- Root technicians modify the digital shape in real-time: arch, heel, width, postings
- Vacuum formed over CAD/CAM positive model, direct milled or 3D printed Root Frame — replicable, consistent, precise
Real-time control over shape, function, and fit.
FitFoot360 gives Root's technicians complete digital control over every dimension of the orthotic frame — in real time. What once required physical carving and guesswork is now precise, repeatable, and stored permanently for every patient.
Digital positive model
Stored indefinitely. Future pairs, replacements, or modifications can be fabricated from the exact same shape without a new impression.
Real-time shape modification
Root technicians control arch, heel, width, and postings directly in the software.
Every parameter visible
Heel cup depth, frame reinforcement, ray cut-outs, flanges, and more are set per patient, not per template.
Plaster and foam digitisation
Physical models can be digitised for permanent storage. Note: digitising may not perfectly replicate the intimate contours achieved when vacuum forming directly over plaster.
Built to their spec. Built for their foot.
Every parameter of the Unit is set to the individual patient — frame rigidity, rearfoot posting, heel cup depth, and covers are all chosen for that patient's anatomy, weight, and activity demands. Forefoot is balanced to rearfoot and the device is custom congruent to the foot model.
An entirely rigid polypropylene frame calibrated to patient weight — akin to the once-popular Rohadur style, built for heavy loads.
No frame filler — a clean, entirely rigid shell delivering full functional support.
A unitized polypropylene extrinsic rearfoot post — complete functional rearfoot control without the compression of a crepe post.
Pressed directly from the patient's calcaneus, the heel cup fits their heel precisely — controlling their specific degree of inversion and eversion.
A low-profile Protex top cover — also available with no cover for swimming and water-shoe applications (see S12 Water).
No forefoot extension — the device is arch-length, keeping the rigid frame low-profile.
No bottom cover — the rigid polypropylene frame seats directly in the shoe.
The full picture.
Everything you need to prescribe the Unit.
- Bone deformity
- Foot deformity
- Arthritis
- Musculoskeletal pathology
- Endomorph body type
- Lower extremity pathology
- Poor posture
Recommended for
- Shoes with removable insoles
- Patients over 250 lbs
- Sports injury pathologies
The Unit is similar to the Classic Sport in versatility but with increased support — a great option for active patients weighing more than 250 pounds who need rearfoot control from a unitized extrinsic post. Its rearfoot post is polypropylene, giving complete functional control without the compression of a crepe post.
As an entirely rigid frame, the Unit recalls the once-popular Rohadur material and style. It ships with a vinyl top cover, or with no top cover for swimming and water-shoe applications (see the S12 Water device). Built from a positive model of the patient's foot and modifiable at the practitioner's discretion.
- L3000 (UCB)
- L3010 (longitudinal/metatarsal support)
- L3020 (arch support)
- L5000 (filler)
Based on configuration. For reference only. Final coding and billing are the provider's responsibility.
Delivery Time
- Standard: 2 weeks
- Expedited: Available on request
An entirely rigid frame for complete control.
The Unit pairs an entirely rigid polypropylene frame with a unitized polypropylene rearfoot post — complete functional control to the rearfoot without the compression of a crepe post. The 12mm heel cup controls inversion and eversion of the calcaneus, stabilizing the foot at the subtalar joint through the gait cycle.
With increased support over a standard functional device, the Unit handles patients over 250 pounds — recalling the rigid Rohadur style, and available with or without a top cover for water-shoe applications.
The right frame
for heavy loads.
Unit sits on the Performance frame profile — an entirely rigid, heavy-build platform
for complete rearfoot control in patients over 250 lbs.
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