Ultralight Runner
Built for race day. A Celucyte frame - supportive, conforming, and virtually weightless - carries an integrated arch filler and rearfoot post, so a perforated 3mm Prolite top cover is the only material added on top.
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Support that weighs almost nothing.
The Ultralight Runner device is designed for serious, weight-conscious runners. Its unique Celucyte frame is supportive, conforming, and virtually weightless, built congruent to the runner's own foot model.
Every gram counts over 26.2 miles. The Celucyte frame integrates the arch filler and rearfoot post into the shell itself, eliminating the heavier materials and adhesives a conventional build needs.
Low-volume racing flats
No bottom cover and no extension - the frame and a single top cover are all that go into the shoe, so it fits low-volume racing flats.
Perforated Prolite top cover
A performance-oriented, perforated 3mm Prolite top cover offers durable cushioning and moisture control over long distances.
Stability without the weight
An integrated arch filler and intrinsic rearfoot post maintain the stability and control needed for top performance, with an 18mm heel cup holding the rearfoot.
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 sport 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 Ultralight Runner device 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 Celucyte frame, with its integrated arch filler and rearfoot post, is 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 Ultralight Runner 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.
- Ultralight Runner frame fabricated - the Celucyte frame is formed over the positive model with an 18mm heel cup and an integrated arch filler and intrinsic rearfoot post, so no separate filler, post, or adhesive layer is needed. A perforated 3mm Prolite top cover is applied, forefoot balanced to rearfoot. No bottom cover and no extension.
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 Ultralight Runner device is set to the individual patient. Frame contour, heel cup depth, and cover selection are chosen for that runner's anatomy and race shoe. Forefoot is balanced to rearfoot and the device is custom congruent to the foot model.
A unique Celucyte frame - supportive, conforming, and virtually weightless - formed to the patient's own foot model.
The Celucyte frame carries an integrated arch filler, eliminating heavier materials and adhesives.
The rearfoot post is integrated into the frame, maintaining stability and control with no added mass.
An 18mm heel cup holds the rearfoot securely through the whole race without a separate post.
A performance-oriented, perforated Prolite top cover offers durable cushioning and moisture control.
No bottom cover - the frame seats directly on the shoe footbed, keeping total weight and volume minimal.
No extension, leaving the forefoot of a low-volume racing flat completely free.
Forefoot is balanced to rearfoot and the frame is custom congruent to the patient's foot model.
The full picture.
Everything you need to prescribe the Ultralight Runner device.
- Symptomatic feet while running
- Biomechanical pathology
Recommended for
- Weight-conscious, high-performance runners
- Low volume racing flats
- Runners with mild to moderate pathology
- Performance enhancement
The Ultralight Runner device is designed for serious, weight-conscious runners. Its unique Celucyte frame is supportive, conforming and virtually weightless, paired with our performance-oriented, perforated Prolite top cover, which offers durable cushioning and moisture control.
The Celucyte frame has an integrated arch filler and rearfoot post, eliminating the need for heavier materials and adhesives while maintaining the stability and control needed to achieve top performance.
Constructed 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
Stability at the lowest possible mass.
The Ultralight Runner device pairs a Celucyte shell with an integrated arch filler, an intrinsic rearfoot post, and an 18mm heel cup. Building the filler and post into the frame is what delivers control at a fraction of the weight of a conventional build.
A perforated 3mm Prolite top cover adds durable cushioning and moisture control, and with no bottom cover or extension the device disappears inside a racing flat.
The right frame
for race day.
The Ultralight Runner device sits on the Performance frame profile, stripped
to a Celucyte frame and a single top cover for racing flats.
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