A03 · Applications
The season is the specification.
Casual programmes are not won on abrasion figures. They are won on hitting a colour, holding it through production, and getting tooling cut fast enough that the range ships in the season it was designed for.
What this segment demands
The engineering constraints that dominate work and athletic footwear mostly relax here, and three commercial ones take their place: unit cost at seasonal volume, colour fidelity across a run, and how quickly tooling can be cut and re-cut. A casual sole that tests beautifully and lands a month after the range went to retail has failed.
That points at the thermoplastic families. TPR takes colour cleanly, tools quickly, and its sprues and runners are regrind-friendly rather than scrap, which is where a meaningful part of the unit cost difference comes from at volume. Foamed rubber is the other route: it keeps the wear behaviour of solid rubber while dropping density, which is what a comfort-led casual shoe is actually asking for.
Colour is the part that most often goes wrong, and it goes wrong after sign-off rather than before. Shrinkage and yellowing have no single common standard, so they get run to your protocol — which means we need the protocol, or at minimum the colour standard and the conditions you will judge it under. A pantone reference with no ageing condition attached is not a specification a factory can hold.
Hardness for this segment sits in a narrow band across the families we would propose, and the numbers below are windows we hold in production rather than what the material category can reach. Watch the scale when you compare them: solid rubber, foamed rubber and TPR are all quoted in Shore A, and only the EVA sole is in Shore C. The two scales do not convert, and a supplier sheet that runs them into one column is telling you something.
Which sole system, and why
More than one family will do the job. What separates them for this segment is below; the full specification envelope for each is on its own page.
The volume default. Fast tooling, clean colour reproduction and a regrind-friendly process, which is what makes the unit cost work at seasonal quantities.
Where the shoe is sold on comfort. Solid-rubber wear behaviour at well under half the density, so the shoe gets lighter without the tread giving up.
For high-volume runs where the sole is injected directly and cycle time dominates the cost model.
Hardness we hold for this segment
Windows measured on the compounds we run, not the range the material category can reach. Rubber, foamed rubber and TPR are quoted in Shore A; EVA soles and midsoles in Shore C. Why the two do not convert.
| Application | Hardness | Density |
|---|---|---|
| TPR outsole | 60–65 Shore A | 1.00 g/cm³ |
| Foamed rubber outsole | 60–65 Shore A | 0.40 g/cm³ |
| Rubber outsole, casual / lifestyle | 60–65 Shore A | 1.15 g/cm³ |
| EVA sole, casual / slipper | 55–60 Shore C | 0.25 g/cm³ |
What gates the specification
The tests that decide whether a sole for this segment passes. Eight rigs run on site; the full rig-to-standard mapping and what goes to an external laboratory is on the quality page.
| Shrinkage and yellowing | No single common standard exists, so this runs to your brand protocol. Send it with the enquiry — it is the test that decides whether a colour survives the season. |
|---|---|
| Colour hold | Judged against your colour standard under the conditions you name. A reference without an ageing condition is not something a factory can commit to. |
| Abrasion resistance | ISO 4649 method A. Lower priority than in work or athletic footwear, but still the figure that separates a sole that looks worn in a season from one that does not. |
| Hardness and density | SATRA TM205 and ISO 2781. Density is the lever on unit weight and on material cost per pair, so it is worth specifying rather than inheriting. |
Where this stops being ours
- Cemented leather-soled and welted constructions are a different trade. If the shoe wants a leather sole we are not the supplier.
- Vulcanised canvas footwear — the foxing-tape construction — is built on the shoe last rather than moulded as a separate unit, so the sole is made by the shoe factory rather than bought in.
- Where the range is genuinely single-season and volumes are small, the tooling cost per pair is what decides the programme rather than the sole spec. The mould cost guide sets out the arithmetic before you commit.
What we need to quote this
Beyond the standard checklist: the colour standard and the ageing protocol you will judge it under, the size run, and the season date you are working back from. Tooling turnaround is usually the binding constraint here, not moulding.
The standard checklist, and the six stages a programme runs through, are on the development page.
Our own figures, not a category benchmark. Held across the six sole systems; a programme that moves them says so in the quotation. Full terms, tooling cost and mould ownership are on the OEM & ODM page.
Other footwear segments
Building for casual & lifestyle?
Send the drawing, the sample or the standard you certify to. We come back with the sole system, a compound and hardness recommendation, and a tooling plan.