EVA foam is the firmest and most durable insert, PU/EPE foam is lighter and cheaper with softer cushioning, and a velvet-wrapped insert delivers the highest perceived value — the right choice depends on product weight, fragility and target price point.
The insert is the part of a gift box the customer actually touches. Get it wrong and a premium box feels hollow; get it right and a mid-range box feels expensive. This guide compares the four insert types we run most often, with the numbers that decide the choice. Zhengyang Packaging has cut and wrapped all four insert types at its Dongguan factory since 2006, holding every insert to the same ΔE ≤ 2 colour tolerance as the box.
The four insert options at a glance
| Insert type | Density | Feel | Cushioning | Tooling | Relative cost |
|---|---|---|---|---|---|
| EVA foam | 90 kg/m³ | Firm, dense | Low–medium | Die-cut or CNC | Medium–high |
| PU foam | 35 kg/m³ | Soft, springy | High | Die-cut | Medium |
| EPE (PE) foam | 28 kg/m³ | Light, semi-rigid | Medium–high | Die-cut | Low–medium |
| Velvet on foam/board | — | Soft, premium | Set by the core | Wrap + core | High |
EVA foam: the firm, reusable option
EVA is a closed-cell, high-density foam. It holds a precise cut cavity, does not shed, and springs back after repeated use.
- Best for — watches, jewelry, electronics, tools and any product meant to be stored in the box.
- Protection — resists compression; keeps a heavy or sharp item from shifting.
- Cost driver — density and thickness; high-density EVA is the most expensive core here.
Because EVA machines cleanly, complex cavities with tight tolerances — held within ±0.5 mm of your artwork — are practical.
PU and EPE foam: light, cheap, protective
PU foam is open-cell and soft; EPE is the lightweight semi-rigid foam used in almost every protective mailer.
- Best for — cosmetics, glass bottles, gift sets and e-commerce parcels where the box ships by air.
- Trade-off — PU can yellow over time; EPE feels less premium to the touch than EVA.
- Cost driver — foam density and die geometry; both are cheaper than EVA per unit.
If freight cost matters, EPE wins: it cushions well at a fraction of EVA’s weight.
Velvet-wrapped inserts: the value signal
A velvet (or suede-effect) surface laminated over a foam or board core is the standard for jewelry and luxury gifting.
- Best for — rings, necklaces, watches and limited-edition sets.
- The core still matters — the velvet is only the skin; a firm EVA or board core stops the cavity from collapsing.
- Cost driver — the wrap process is largely manual, so labour, not material, sets the price.
Colour matching matters here: we hold velvet and printed box faces to the same ΔE ≤ 2 tolerance so the wrap and the box never look like two different products.
Matching the insert to the product
| Your product | Recommended insert | Why |
|---|---|---|
| Watch, jewelry, tools | EVA | Firm cavity, reusable, premium feel |
| Heavy or sharp item | High-density EVA | Holds shape under load |
| Fragile glass | PU or EPE | Softer cushioning, absorbs shock |
| Air-freight e-commerce | EPE | Lightest protection per unit |
| Luxury / attention gifting | Velvet on EVA or board | Highest perceived value |
Tooling, MOQ and lead time
Inserts are cut with a die or machined by CNC. Once the cavity drawing is approved, inserts add little to the schedule: samples ship in 3–8 days and mass production runs 7–15 working days. Minimum order is 500 pcs across insert types.
For the box structure, see our comparison of grey board vs. corrugated. For the surrounding box choices, start from our complete packaging materials guide, or view the custom rigid boxes we manufacture with matching inserts.
Decision checklist
- Weigh the product — heavy items need EVA or high-density cores.
- Decide if the box will be reused or stored (EVA) or shipped once (EPE).
- Set the target price point — velvet signals premium but costs the most.
- Confirm the cavity tolerance and request a physical insert sample.
- Match insert colour to the box face within ΔE ≤ 2.
Conclusion
The insert is a small part with an outsized effect on how a box feels and how well it protects. Match density and cushioning to the product’s weight and fragility, then let the target price point choose between EVA, foam and velvet. Request a sample so you can judge it in the hand, not on a spec sheet.