Description

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Product Overview

The Seamless U-Back T-Shirt Bra is engineered for seamless layering under form-fitting apparel, utilizing precision laser-cut thermal bonding and an ergonomic U-shaped back architecture. Built for apparel brands, private label collections, and retail importers, this model eliminates VPL (Visible Panty Lines equivalent for bras) and hardware pressure points. Manufactured in our audited innerwear facility with automated bonding lines, we support full OEM/ODM execution-from custom fabric engineering and proprietary cup molding to private label branding and retail-ready packaging.

Key Features

Thermal Bonded Edge Construction: Laser-cut raw edges joined via high-frequency heat bonding instead of traditional stitching, preventing seam telegraphing through tight garments.

Ergonomic U-Back Architecture: Contoured rear panel anchors the band centrally, distributing vertical tension evenly across shoulders to prevent strap slippage and dorsal roll indentation.

Molded Breathable Cup: Lightweight polyurethane (PU) memory foam core laminated with moisture-wicking warp-knit fabric, retaining shape through repeated compression cycles.

Hardware-Free Profile: Constructed without metal rings or sliders on standard specifications, eliminating skin pressure points and enabling industrial laundering compatibility.

Technical Specifications

Parameter	Specification Details
Style Code	SBR-U206
Size Range	US/EU 32A - 40DD (Custom sizing matrices available)
Body Fabric Composition	75% Nylon, 25% Spandex (40D high-recovery elastane fiber)
Fabric Weight (GSM)	210 GSM +/- 5% (Warp-knit interlock)
Cup Construction	3mm molded breathable foam, polyester inner lining
Bond Peel Strength	>= 35 N/50mm (Tested via ASTM D2724)
Color Fastness	Grade 4-5 (AATCC Test Method 61, Wet/Dry Rub & Laundering)
MOQ (Per Color/Style)	1,000 pcs (Allocated across size matrix)
Production Lead Time	35-45 days post-PPS approval

Materials & Construction

Yarn & Filament: High-tenacity nylon paired with high-recovery elastane (verified via FTIR testing) to secure permanent dimensional stability and prevent edge curling.

Adhesive System: Imported German TPU thermoplastic adhesive film applied via automated thermal presses, ensuring wash-resistant performance at 60 deg C laundering thresholds.

Stitching & Assembly: 4-needle 6-thread flatlock stitching on stress-bearing zones using continuous filament nylon thread to eliminate localized friction.

Sizes & Customization

01/

Size Grading: Standard US/EU cup and band dimensions. Custom Asian or UK grading available based on tech pack specifications.

02/

Dyeing & Color Matching: Pantone (TPX/TCX) matching with >= 95% visual accuracy under D65 light source (Minimum 500 pcs per color lot).

03/

Cup Modifications: Unlined molded foam, moderate push-up gradations, or removable pad inserts.

04/

Private Label Integration: Heat-transfer tagless care labels, custom woven labels, and branded elastic band jacquard execution.

Applications

Daily Retail Intimates: Department store and mass-market innerwear portfolios focused on smooth contouring under fine-gauge fabrics.

Athleisure & Loungewear: Low-impact crossover apparel requiring wirefree comfort and moisture management.

DTC E-Commerce Brands: Scaled production runs for digital-first apparel lines requiring strict adherence to quality gates and custom unboxing requirements.

Quality Control

Inline with ISO 2859-1 (AQL 2.5 Major / 4.0 Minor) sampling standards:

Raw Material Inspection

Fabric burst strength, GSM scale verification, and spectrophotometer color checking prior to cutting.

In-Process Audit

Laser-cut dimensional tolerance checks (+/- 0.5 mm) and thermal press temperature/pressure log monitoring.

Physical Lab Testing

In-house testing for bond peel strength, strap fatigue cycling (>= 5,000 stretch cycles), and elastic recovery.

Final Inspection

Needle detection scanning (Pass threshold: 1.0mm ferrous particle detection) and pull-test verification for all attachment points.

Packaging & Private Label OEM/ODM

Export Cartons: Individual units packed in recycled LDPE polybags with desiccant, loaded into 5-layer corrugated master cartons (ISTA 1A drop-test certified).

Retail & FBA Compliance: Support for custom hangtags, belly bands, printed box sleeves, and master carton barcode labeling (UPC/FNSKU compliant).

OEM/ODM Workflow: Tech pack audit -> Prototype sampling (7-10 days) -> Pre-Production Sample (PPS) sign-off -> Bulk manufacturing -> Third-party PSI coordination -> FOB/CIF global shipping.

Frequently Asked Questions

Q: What is the standard lead time for sampling and bulk execution?

A: Physical proto-samples require 7 to 10 days upon tech pack confirmation. Bulk production takes 35 to 45 days following Pre-Production Sample (PPS) sign-off and deposit receipt.

Q: How do bonded seams withstand industrial laundering?

A: We utilize German TPU adhesive film applied under calibrated heat and pressure. Peel strength tests confirm retention above 35 N/50mm after 50 consecutive domestic machine wash cycles at 40 deg C.

Q: Can you accommodate custom color swatches and fabric blends?

A: Yes. Pantone TCX color matching requires a minimum order quantity of 500 pcs per color. Alternative blends (e.g., modal-cotton-spandex or recycled nylon) are available upon request.

Q: What are your minimum order quantities (MOQ) for private label runs?

A: Baseline MOQ is 1,000 pieces per style, distributable across up to 4 sizes and 2 colorways. Trial orders can be evaluated based on raw material stock availability.

Q: Do your components comply with restricted substance regulations?

A: All fabrics and accessory materials comply with OEKO-TEX Standard 100 Class II requirements, ensuring complete absence of restricted aromatic amines, formaldehyde, and heavy metals.

Q: What third-party inspection agencies are supported?

A: We regularly cooperate with buyer-appointed inspection firms, including SGS, Intertek, and Bureau Veritas, for pre-shipment inspections (PSI) prior to final balance settlement.

Request a Quote

To secure a precise commercial and technical quotation, submit the following specifications to our engineering team:

1.Order volume, size distribution, and color breakdown
2.Fabric composition and GSM requirements

3.Destination port and shipping terms (FOB Ningbo/Shanghai or CIF terms)
4.Tech pack, design sketches, or reference physical samples
Contact Email: [Insert Business Email]

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