Select language
This guide is for brand owners, sourcing managers, product developers, importers, and wholesalers managing a custom PU slide project. It is practical purchasing guidance. The actual number of samples, cost, timing, and approval authority depend on the construction, tooling, materials, branding, size range, destination market, and internal buyer process.
Before requesting the first physical pair, create a one-page sample map. It should list every planned round, the question that round must answer, the expected sample status, the required reviewers, and the release decision.
A useful map can include:
Do not assume that sample names have the same meaning at every supplier. Terms such as prototype, development sample, fit sample, confirmation sample, sales sample, and pre-production sample can overlap. Define the purpose instead of relying on the label.
The first round should normally answer whether the overall product direction is workable. Review silhouette, footbed shape, strap width and position, toe and heel proportions, outsole profile, major construction, and the approximate relationship between components.
At this stage, some colours, surface finishes, logos, or packaging items may still be temporary. Mark them clearly. If a buyer rejects the overall shape only after final branding or colour work has been completed, development effort is lost and earlier approvals become difficult to interpret.
The gate output should state one of three positions:
This round should show the actual or clearly identified target PU system, strap material, colour references, surface texture, gloss or matte direction, and any relevant lining or contact material.
Do not write final material approved when only a colour chip was reviewed. A colour reference does not prove density, feel, recovery, wear behaviour, bonding, or finished appearance on the real component. Record whether approval applies to a loose material swatch, a moulded component, or the complete sandal.
If alternative materials are still being compared, give each option a code. Comments such as use the softer one are unsafe when the samples later become separated from the message thread.
Use a controlled size or agreed size set to review footbed length and width, strap opening, strap position, toe room, heel position, pair weight where relevant, and any construction-specific functional point.
The buyer should distinguish between a dimensional result and a wear-trial impression. Both can be useful, but they answer different questions. A wearer saying comfortable does not replace measurement records, and a pair matching dimensions does not prove that the target user will accept the fit.
Where the design uses several sizes, state whether the gate approves one base size only or the full size grading. This avoids treating one approved pair as evidence for every size.
Once the construction and relevant surfaces are stable, review the logo on the actual component. Check artwork version, method, position, orientation, scale, colour, edge quality, legibility, and interaction with curvature or texture.
Photographs are useful for remote review, but they should identify the sample code and include consistent lighting, a straight view, detail views, and a scale reference where dimensions matter. If appearance is sensitive, keep a physical reference because screen colour and exposure can change what reviewers see.
This gate should also confirm whether the logo approval applies to one colourway or all planned colourways. Contrast and legibility can change when the base colour changes.
The pre-production sample should represent the production-intended specification as closely as the project requires. The buyer should be able to trace it to the current tech pack, bill of materials, colour references, logo artwork, size information, packaging specification, and approved change list.
Before release, identify every known deviation. If a component is still temporary, the sample cannot silently act as the final reference for that component. The release record should state whether the deviation is accepted for the sample only, accepted for production, or still open.
A pre-production gate is stronger when it answers five questions:
Attach or link a small approval sheet to each sample. Include:
Avoid a general approved status when only one aspect was accepted. A sample can be approved for shape while colour and logo remain open. Purpose-limited approval keeps the record honest.
Each comment should identify the location, current condition, requested condition, reference, and importance. For example, increase the inside strap opening at the marked measurement point to match revision B is more useful than strap too tight.
Use numbered images or marked drawings. Separate objective nonconformities from preferences. If the sample differs from a stated requirement, cite that requirement. If the buyer is changing the requirement, record it as a change and assess its effect on tooling, materials, price, timing, testing, and other approvals.
Messages, video calls, and annotated photos are convenient, but the final decision should be consolidated into one controlled record. Otherwise the factory may receive conflicting comments from design, purchasing, and marketing.
Choose one current approval sheet or project tracker. Older files should remain traceable but clearly superseded. The physical reference sample, digital record, and specification revision should point to one another.
After a gate is approved, a change may affect more than the edited detail. A new strap thickness can affect fit and attachment. A new colour can affect logo contrast. A packaging change can affect packed dimensions and transit checks.
Do not edit the master specification quietly. Record the reason, affected items, responsible reviewers, samples or tests to repeat, commercial impact to confirm, and new approval status. A late change is not automatically wrong; an untracked change creates avoidable risk.
Before authorising the next round, confirm:
There is no universal number. A proven construction with a simple logo may need fewer rounds than a new mould, new material, several colourways, or a demanding destination-market brief. The safer rule is to define the questions that must be answered, then use the minimum number of rounds that produces reliable evidence.
Photos can support approval of some visible points if the images are controlled and the sample identity is clear. They are weaker for fit, cushioning, surface feel, exact colour, dimensions, and other physical characteristics. State exactly what a photo-based approval covers.
Terminology varies. Define whether the retained reference is the final approved production standard, who holds each copy, and which specification revision it represents.
Assign decision owners before sampling. Consolidate comments through one project owner and do not release the next stage until conflicting decisions are resolved.
It may be reviewed in parallel or separately. The important point is to show whether packaging is final, which artwork version applies, and whether packed-product checks are still open.
[1] ISO 10005:2018, guidelines for establishing, reviewing, accepting, applying, and revising quality plans. [2] ISO 9001 Auditing Practices Group, design and development process guidance. [3] ISO guidance on documented information. Full links and scope notes are listed in sources.txt.
Henghao Slide Sandals Factory states that it supports custom PU slide development for overseas buyers. To discuss a project-specific sample route, send the reference design, target market, size range, branding, material direction, packaging needs, and expected order range through the Buyer Help Center or Contact page. Sample stages, timing, costs, and factory capability must be confirmed for the actual project.
