Thin
Zero drop and low thickness so the foot feels the ground.
Materials for barefoot footwear
Barefoot feel. Engineered to last.
Very soft, flexible compounds for thin soles with abrasion resistance: thermoplastic rubber for sole injection and PVC for direct injection onto the upper.
- +50
- years formulating for footwear
- 2
- technologies: TR and PVC
- 100%
- recyclable
- REACH
- compliance
01 — The challenge
In a barefoot sole, the material is everything.
Soft
Low hardness with longitudinal and torsional flexibility.
Durable
Withstands abrasion and repeated flexing without cracking.
02 — Kids' footwear
Designed for growing feet.
A child's foot is still developing. A thin, soft, flexible barefoot sole lets it move, support itself and work as it would barefoot. That's why this range is especially suited to kids' footwear: it respects the natural growth of the foot.
The shoe follows the foot; it doesn't constrain it.
Freedom of movement
The sole flexes with the foot in every direction, without stiffening it.
Natural stride
Zero drop: heel and forefoot at the same height, without altering posture.
Feels the ground
Thin sole that transmits the ground when walking, like going barefoot.
Lightness
TR has a density of 0.91 g/cm³: light soles that don't tire.
Withstands play
Abrasion resistance for intense everyday use.
Safe materials
REACH compliant. The PVC is formulated without phthalates.
For the manufacturer
Tailor-made kids' collections.
- Low hardness formulated for each model and size.
- Custom colour and opaque, translucent or rubber-effect finishes.
- Samples to test on your own machine.
03 — Materials
TR or PVC: choose your process.
Two injection technologies for two ways of making a barefoot sole.
Thermoplastic rubber (TR)
SBS-based compound for sole injection; the sole is then cemented or stitched to the upper. Very soft touch and high flexibility with good abrasion resistance. Opaque, translucent or rubber-effect finishes. 100% recyclable.
Ideal for
Thin barefoot soles for casual, light outdoor and kids' footwear assembled by cementing or stitching.
Process
Sole injected in a mould → cemented or stitched to the upper.
04 — Properties
What your sole needs.
Very soft touch
Low hardness for a natural, comfortable step.
High flexibility
The sole follows the foot's movement in every direction.
Abrasion resistance
Low thickness doesn't mean short service life.
Grip
Good traction on varied surfaces.
Stable processing
Consistent machine behaviour batch after batch.
Tailor-made
Hardness, colour and finish formulated for your model.
05 — Technical data
TR vs PVC.
| Property | TR | PVC |
|---|
Note: These data should be considered indicative values for users. They refer to tests carried out in our laboratory on test specimens, and do not guarantee that these values fully or partly match those obtained by other laboratories, even when the same analysis methods are used.
06 — How we work
From briefing to production.
- 01
Briefing
Tell us the model, process, hardness and finish you need.
- 02
Formulation
We tune the compound in our laboratory.
- 03
Samples on your machine
Trials under your real injection conditions.
- 04
Validation
We check results and fine-tune as needed.
- 05
Production and technical support
Stable supply and ongoing technical support.
07 — FAQ
Frequently asked questions.
TR or PVC?+
It depends on your process: if you inject the sole and then cement or stitch it, TR; if you use direct injection onto the upper, PVC. We advise you based on your machinery.
What hardness do I need?+
It depends on thickness, use and the feel you want. We formulate the hardness for your model.
Can I test it on my machine?+
Yes. We send samples so you can test them under your real injection conditions.
What colours and finishes are available?+
Custom colour. TR: opaque, translucent or rubber effect. PVC: opaque, rubber effect.
Are they recyclable and REACH compliant?+
TR is 100% recyclable and PVC is phthalate-free and REACH compliant.
08 — Contact
Tell us about your sole.
Process, hardness and finish. We'll propose the compound and send samples.
- Ctra. Nacional 340 km 723,8, 03295 Elche (Alicante)
- +34 965 452 141
- synthelast@synthelast.es