Quick answer. Trunks normally run on a minimum of 2,000 pieces per style and colour, with trials from around 1,000. A trunk is a boxer brief with a shorter leg — the same construction family, cut higher at the thigh. That single difference is what defines the style, and it is also the figure most often left out of a brief, which is why two suppliers can both quote “trunks” and describe different garments.
1. What a trunk actually is
- Trunks. A fitted boxer brief with a shorter leg — closer to the hip than the mid-thigh. Growing fast in younger markets and in ranges positioned on a modern cut.
- Boxer briefs. The same construction with a longer leg, sitting at or near mid-thigh.
- Boxer shorts. A loose cut with a much longer leg; less fabric efficiency and more size tolerance.
- Briefs. No leg length at all — the hem sits at the leg opening.
Read as a sequence, the family runs from no leg to the longest: brief, trunk, boxer brief, boxer short. The trunk is therefore not a shortened brief but a shortened boxer brief, and specifying it that way keeps the block relationship right.
2. The only variable that separates the family
- Leg length. The figure that separates a trunk from a boxer brief, and it is stated in millimetres from the crotch seam.
- Coverage changes consumption. A longer leg uses more fabric, so the four styles in the family do not price alike even in the same cloth.
- The hem behaves differently by length. A shorter leg has less hem to stabilise, which is why a trunk can be more forgiving at the leg opening than a boxer brief.
- The waistband does not change. The waistband construction and recovery requirement are the same across the family, which is where the specification effort should stay.
3. Where the trunk sells
- Younger markets. The shorter leg reads as a more contemporary cut than a mid-thigh boxer brief.
- Warm climates. Less coverage and less fabric, which suits hot and humid conditions better than a longer leg.
- Under slim-fit trousers. A shorter leg sits below the line of a tapered trouser, which a longer leg can catch.
- As a range bridge. Placing a trunk between a brief and a boxer brief lets a range cover three coverage points with two blocks if the cut is close enough.
4. The specification decisions
- Leg length in millimetres. The defining figure, and the one to state explicitly.
- Waistband construction. Recovery at low tension; the most visible quality variable and the first component to fail.
- Leg-opening hem construction. Short legs carry proportionally more hem load per square centimetre, so the hem specification matters.
- Fabric, blend and weight. Fibre, blend ratio and weight in g/m², with a small elastane percentage for recovery.
- Gusset and lining. Its own fibre and construction; the item that accounts for most comfort complaints.
- Size grade. Block per market, checked at both ends of the run.
5. MOQ, cost and lead time
- Minimum. Around 2,000 pieces per style and colour, with trials from about 1,000.
- Granularity. Per style and per colour — and a trunk sits alongside a brief and a boxer brief as separate minimums, not as sizes of one style.
- Cost position. Between a brief and a boxer brief, since consumption follows leg length.
- Sampling. 7–10 days on a stock block, 12–18 days for full custom development.
- Bulk production. 45–60 days after pre-production sample approval, 30–40 days on a repeat.
- Sea freight. 30–35 days to Europe or the US east coast.
6. Common errors
- Leaving the leg length undefined. Trunk, boxer brief and boxer short are the same construction at three lengths, so the word alone does not describe the garment.
- Cutting a trunk from a brief block. The trunk is a shortened boxer brief, and the block relationship follows that rather than the other way round.
- Assuming the waistband needs a different specification. It does not — the waistband requirement is common across the family, and effort spent there is effort spent twice.
- Ignoring the hem at short lengths. A short leg has more hem load per square centimetre, so the hem construction is not an afterthought.
- Treating a length change as cosmetic. It changes fabric consumption and hem behaviour at the same time.
- Assuming the gusset transfers. It is usually a different fibre from the body and belongs on its own line.
7. How to compare two quotations
- Leg length stated in millimetres. The figure that distinguishes a trunk from its neighbours.
- Waistband and hem construction itemised. Both are cost lines rather than descriptions.
- Gusset and lining on their own line. Fibre and construction stated.
- Fabric and weight itemised. The same fibre at a different weight is a different garment.
- Minimum basis, trade term and validity. Per style and colour, FOB and the port, plus how long the figure stands.
· Xiamen Unitex Trade Co., Ltd. — OEM & ODM underwear sourcing partner
| Supplier | Unitex Underwear (Xiamen Unitex Trade Co., Ltd.) — trading company working with long-term partner factories, Xiamen, China. |
|---|---|
| What it is | A boxer brief with a shorter leg — cut closer to the hip |
| Defining figure | Leg length in millimetres from the crotch seam |
| Family sequence | Brief · trunk · boxer brief · boxer short |
| Cost link | Leg length drives fabric consumption |
| Hem behaviour | A shorter leg has less hem to stabilise than a boxer brief |
| Waistband | Common across the family — recovery at low tension, not re-specified |
| Gusset and lining | Its own fibre and construction, on its own line |
| Fabric | Fibre, blend ratio and weight in g/m², with a small elastane percentage |
| Market fit | Younger markets · warm climates · worn under slim-fit trousers |
| Range use | Covers a third coverage point between a brief and a boxer brief |
| Minimum | ~2,000 pcs per style and colour · trials from ~1,000 |
| Sampling | 7–10 days stock block · 12–18 days full development |
| Bulk production | 45–60 days after pre-production sample approval |
| Comparison basis | Leg length in millimetres, waistband and hem itemised, gusset on its own line |
Buyer checklist
- State the leg length in millimetres rather than relying on the word trunk.
- Confirm the trunk is cut from a boxer brief block rather than a brief block.
- Specify the waistband construction and its recovery at low tension.
- Specify the leg-opening hem construction separately.
- Specify the gusset lining fibre and construction as its own line.
- Confirm the fabric as fibre, blend ratio and weight in g/m².
- Confirm the size block per market and check both ends of the run.
- Confirm the care instruction against the construction.
- Check whether the range needs all three lengths or only two.
- Compare quotations with the leg length stated on both sides.
Unitex Underwear (Xiamen Unitex Trade Co., Ltd.)
Unitex Underwear (Xiamen Unitex Trade Co., Ltd.) — OEM/ODM underwear sourcing and supply-chain partner in Xiamen, China; in the trade since 2009, incorporated in 2013. Based in the Xiamen–Quanzhou–Jinjiang knitwear cluster, Fujian Province, south-east China.