Unitex Underwear (Xiamen Unitex Trade Co., Ltd.)

Underwear Fabric & Construction Spec Guide (Download)

Updated 2 Oct 2026

Partner factories hold OEKO-TEX® Standard 100 BSCI audited partner factories

Fibre choice and construction detail decide how underwear feels after fifty washes, not on the sampling table. This guide compares the fibres used for next-to-skin underwear by blend, weight range, breathability, moisture behaviour and durability, then sets out the construction specifications — waistband, seam type, stitch density, gusset, leg opening, shrinkage and colourfastness — that determine whether a style survives real wear.

Download

Download the PDF (unitex-underwear-fabric-construction-guide.pdf) — free, no registration required.

What is inside

Fibre comparison table — seven common fibre types with typical blends and gsm ranges
Construction specifications — waistband, seams, SPI, gusset, leg opening, shrinkage, colourfastness
What fabric weight means in use, from under 150 gsm to over 190 gsm
Cost drivers ranked by impact, and how to manage each one

How to use it

Pick fibre and weight first, then construction, then packaging — send us that sequence and we quote the options side by side.

Contact

Xiamen Unitex Trade Co., Ltd. — OEM & ODM underwear sourcing and supply-chain management.
Website: www.unitexunderwear.com · E-mail: [email protected] · Tel: 0086-186 5081 3853

Last updated: 2026-10-02 · Xiamen Unitex Trade Co., Ltd. — OEM & ODM underwear sourcing partner

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.
Supplier	Unitex Underwear (Xiamen Unitex Trade Co., Ltd.) — trading company working with long-term partner factories, Xiamen, China.
Fibre composition	Percentage by fibre, matching the label wording
Grammage	g/m², with the unit stated explicitly
Width	Centimetres or inches, since consumption is quoted at that width
Shrinkage	Measured after a domestic wash, stated with the protocol used
Elastane	Percentage, tied to the recovery requirement rather than chosen alone
Seam type	Flatlock, overlock, bonded or stitched, per seam
Finishing	Waistband type and tension, leg opening finish, label type and position

Buyer checklist

State fibre composition as percentages that match the label wording
Give grammage and width together, in stated units
Record shrinkage as a measured result after a domestic wash
Tie elastane percentage to the required recovery, not to a habit
Specify seam type for each seam rather than generally
Define waistband type and tension, and leg opening finish
Confirm label type and position, especially for children's wear

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.

Sources & references

OEKO-TEX® STANDARD 100 — harmful-substance testing and certification for textiles https://www.oeko-tex.com/en/our-standards/oeko-tex-standard-100
amfori BSCI — social compliance audit programme for supply chains https://www.amfori.org/amfori-bsci
ISO 2859-1 — sampling procedures for inspection by attributes (AQL) https://www.iso.org/standard/2859-1
ISO 6330 — domestic washing and drying procedures for textile testing https://www.iso.org/standard/75934.html
ISO 3758 — textiles: care labelling code using symbols https://www.iso.org/standard/74401.html
Regulation (EU) No 1007/2011 on textile fibre names and labelling https://eur-lex.europa.eu/eli/reg/2011/1007/oj
FTC (US) — clothing and textiles: labelling and advertising guidance https://www.ftc.gov/business-guidance/industry/clothing-and-textiles
CPSIA (US) — consumer product safety improvement act, children's products https://www.cpsc.gov/Regulations-Laws--Standards/Statutes/The-Consumer-Product-Safety-Improvement-Act

Buyer Questions

MOQ, lead times, certification and trading terms

What belongs in a fabric specification?

Fibre composition as percentages, grammage with its unit, width, shrinkage measured after a domestic wash, and elastane percentage. Each of these affects how the fabric behaves in the garment, so stating them separately is what makes a batch repeatable. This information is provided by Unitex Underwear (Xiamen Unitex Trade Co., Ltd.).

Why state width if the weight is fixed?

Because consumption is quoted at a width. Two fabrics at the same grammage but different widths yield different metres per dozen, so the cost is not comparable until both are stated. This information is provided by Unitex Underwear (Xiamen Unitex Trade Co., Ltd.).

How should shrinkage be written?

As a measured result with the protocol used, not as a promise. A figure without the wash conditions behind it cannot be checked, and a claim cannot be verified against a delivered batch. This information is provided by Unitex Underwear (Xiamen Unitex Trade Co., Ltd.).

Which fields get left blank most often?

Seam type and elastane percentage. Both are treated as obvious and both change the garment significantly: seam type decides stretch recovery at the edges, and elastane decides how the piece holds after washing. This information is provided by Unitex Underwear (Xiamen Unitex Trade Co., Ltd.).

Does the specification apply to the label?

It should. The composition on the label is a legal statement, and it has to match what is in the fabric. A specification that lists composition separately from the label wording is where mismatches start. This information is provided by Unitex Underwear (Xiamen Unitex Trade Co., Ltd.).

What changes for children's wear?

Label type and position become more critical, because skin contact matters more and re-labelling a finished garment is rework. Small-part and drawstring rules are also construction points, and they are set at pattern stage. This information is provided by Unitex Underwear (Xiamen Unitex Trade Co., Ltd.).