Clarify the release task for training shoe sole QC

After training shoes arrive at the warehouse, the goal of sole QC is not to judge whether they "look premium," but to confirm whether the current photos are sufficient to support three actions: keep the item, request additional photos, or apply for handling within the after-sales window.

This guide applies to training shoes that have arrived at the kakobuy warehouse and need to check sole bonding quality based on warehouse photos. The focus is on open bonding, excess glue, and midsole misalignment in the forefoot, arch, and heel, as well as obvious structural differences between the left and right shoes.

The article does not apply to judging running performance, support strength, wear life, or actual wearing comfort. Warehouse inspection mainly checks appearance information such as style, quantity, color, size, and model, and cannot replace real wear testing or professional sports shoe inspection.

kakobuy is an online platform providing Chinese product purchasing, warehousing, quality inspection, and international shipping services. After training shoes complete warehouse inspection, buyers should first review the photos clearly before deciding whether to keep, apply for after-sales, or proceed with consolidation and shipping. 🧾

First distinguish structural defects, appearance flaws, and photo shadows

A darker line appearing on the edge of the sole does not necessarily mean open bonding. It could be a normal seam between the midsole and outsole, a shadow caused by shooting angle, rubber texture, or a minor production mark. When judging, consider whether this line is continuously expanding, whether a gap can be seen, or whether it is accompanied by lifting or residual glue.

You can observe in the following order:

1. First look at the overall connection between the sole and upper to confirm whether there is a continuous separation area.

2. Then look at the seam edges for obvious gaps, curling, or openings where foreign objects could enter.

3. Compare with the other side of the same shoe to determine if differences are just due to lighting and angle.

4. Finally, combine close-up photos to confirm whether suspicious areas are clearly visible.

Based on only one distant photo, you should not directly write off shadows as open bonding, nor should you directly judge a small amount of visible glue traces as a serious defect affecting use. A more prudent approach is to first mark insufficient evidence and then request targeted additional photos. 🔍

Inspect bonding edges along forefoot, arch, and heel

Training shoe soles have different stress and flex zones, so when inspecting, don't just look at the toe or the bottom of the sole; instead, move your gaze completely along the outer edges.

Forefoot area

The forefoot is a frequently flexed area. Focus on both sides of the toe, the outer edge of the forefoot, and near the outsole flex line:

• Whether there is a continuous edge gap

• Whether there is partial lifting or visible internal voids

• Whether there is irregular discontinuity between the upper and midsole

• Whether the glue line suddenly breaks and is accompanied by obvious separation

Minor glue marks, small overflow, or incompletely flat edges cannot alone prove that the sole has detached. If the photos cannot clearly show the flex area, request closer photos with less side light and without obstruction by the shoebox.

Arch area

The arch edge usually has a curved surface and is easily affected by shooting angle. Here, observe whether the seam is uniform along the curve, whether there is a section where the midsole clearly bulges outward, or whether the arch line heights between left and right shoes differ significantly.

If only one side photo is available, reliable judgment of left-right differences is impossible. Try to view the same side of both left and right shoes simultaneously, and confirm that the distance and angle of the two photos are similar.

Heel area

The heel is responsible for connecting the upper, heel counter, and outsole. When inspecting, look at the bottom edge of the heel, the junction between the heel piece and midsole, and the left and right heel contours.

Pay special attention to:

• Continuous opening on one side of the heel

• Midsole edge clearly protruding beyond the outsole contour

• Heel height or width obviously different between left and right shoes

• Long glue line breaks or curling at the seam

Slight visual asymmetry of the heel may come from shoe placement angle. Only when placement is similar, viewing angle is similar, and differences remain obvious should it be escalated as an issue requiring further verification.

Check for open bonding, excess glue, or obvious midsole misalignment

Open bonding

Open bonding refers to visible separation in the bonded area, not just color change. More valuable evidence includes edge gaps, partial lifting, continuous gaps, and separation lines visible from multiple angles.

If the photo only shows a dark thin line but no gap, curling, or structural misalignment, it should not be directly determined as open bonding. It can be recorded as "suspected seam, needs additional photos for confirmation."

Excess glue

Excess glue usually appears as visible traces of adhesive outside the seam. The key is location, length, thickness, and whether it affects appearance or connection, not seeing glue and immediately rejecting.

Small, short, and non-affecting-seam-integrity glue marks should generally be categorized as appearance flaw candidates. Large areas, clumping, extending to obvious visible areas, or accompanied by uneven seams are more worth requesting additional photos or after-sales evaluation.

Midsole misalignment

Midsole misalignment refers to the outline of the midsole being obviously shifted relative to the upper or outsole. When checking, don't just look at one point; observe along forefoot, arch, and heel to see if the offset is continuous.

If only bottom sole photos are available, it is usually impossible to accurately judge whether the midsole is misaligned relative to the upper. Side views, heel views, or left-right shoe comparison photos are needed as auxiliary evidence.

Compare left and right shoes for sole height and contour differences

Comparing left and right shoes is more reliable than looking at one shoe alone. It is recommended to compare the following items one by one:

• Whether the forefoot outsole edges are equally flat

• Whether the arch curve shows obvious height difference

• Whether the heel bottom fits equally well

• Whether the midsole white edge or colored edge is exposed at similar positions

• Whether the sole pattern and outer contour conform to the mirror relationship of left and right shoes

When comparing, pay attention to shoe placement direction, lens distance, and light source. If one shoe is closer to the lens, the edge may appear larger; if one shoe is tilted, the sole height may be visually exaggerated. Only when postures are basically consistent do left-right differences have high judgment value.

Record evidence gaps caused by angle, clarity, and obstruction

An actionable QC record should not just say "sole has problems." It should record the problem location, photo evidence, and next steps.

Recommended format:

• Location: left shoe forefoot outer side, right shoe heel inner side, etc.

• Type: suspected open bonding, excess glue, contour misalignment, or insufficient evidence

• Evidence: visible gap, glue trace length, edge curling, or left-right difference

• Impact: temporarily not affecting judgment, affecting appearance, may affect bonding reliability

• Gap: lacking close-up, side view, other shoe comparison, or clear focus

• Action: keep, request additional photos, contact after-sales, or delay consolidation

The following situations should not be directly released, nor directly determined as serious defects:

• Suspicious area obstructed by shoebox, packaging, or sole pattern

• Insufficient image resolution to distinguish seam and gap

• Only one shoe available, cannot perform left-right comparison

• Sole edge in shadow, glue marks and openings cannot be distinguished

• Photo angle cannot simultaneously show the relationship between upper, midsole, and outsole

kakobuy's inspection service mainly focuses on appearance information verification, not laboratory-level testing of sole bonding strength. Therefore, buyers should clearly state the boundaries of photo evidence and avoid mistakenly writing "photos found no obvious problems" as "confirmed sole absolutely has no quality risk." 📷

Use severity checklist to decide additional photos or keep

Severity is not determined solely by flaw area. Location, continuity, whether seam integrity is affected, and photo clarity should all be considered.

If a problem is confirmed, buyers should also note the platform's after-sales time limits and product restrictions. Platform information shows that general products may be eligible for 5-day no-reason return/exchange within 120 hours after warehousing, but customized items, restricted items, adult products, intimate apparel, food, and items where removal of packaging, tags, or accessories has been requested may not be eligible. Specific acceptance should be based on the current order page and customer service confirmation, not solely on the summary in the article.

Complete sole QC review before placing order

Before deciding to keep and consolidate, complete a brief review:

1. Confirm that both left and right shoes have clear side and heel photos.

2. Check along forefoot, arch, and heel for signs of continuous open bonding.

3. Distinguish excess glue, normal seams, and true structural separation.

4. Compare left and right shoes for sole height, outer contour, and midsole exposure.

5. Make specific additional photo requests for all positions with insufficient evidence.

6. Save photos, order information, and communication records within the after-sales window.

7. Do not rush consolidation and shipping for unresolved sole problems.

The core of training shoe sole QC is not to pursue completely no production marks, but to confirm whether there is clear evidence that affects bonding reliability, appearance acceptability, or subsequent after-sales. For parts that cannot be judged by existing photos, additional photos are usually more valuable than guessing. ✅

Plan conclusion

Keeping a pair with only a small amount of glue marks that do not affect seam integrity may save time waiting for additional photos and after-sales communication, but the buyer needs to accept the risk of appearance flaws. Requesting additional photos or after-sales evaluation will increase processing time and may affect consolidation progress, but is more suitable for discovering continuous open bonding, obvious curling, or severe midsole misalignment.

For buyers with clear appearance requirements, preparing for high-frequency training, or unwilling to bear the cost of returns, it is not recommended to directly release when evidence is insufficient. For buyers who can accept minor appearance marks and whose photos show no structural separation, they can record the flaws and then decide whether to continue. Regardless of the chosen approach, it should be based on current photos, order conditions, and platform-confirmed after-sales rules, not treating general QC photos as a guarantee of performance or durability.