Vertex Sport Switzerland: Fitness Unitards Built on Pbt/Polyester Blend

Vertex Sport is a growing Switzerland-based activewear label whose fitness unitards range now anchors its seasonal offer. When the design team planned a wider range with tighter launch dates, it needed a fabric partner able to guarantee construction consistency, documented performance and shade continuity across every production lot.

Vertex Sport: reviewing the fabric swatch set for the fitness unitards programme

The challenge

The main risk in the project was delayed development cycles from a trading intermediary. The previous supply chain ran through a trading intermediary, so there was little visibility of the mill, no construction sheet and no test evidence behind the performance claims. Without that documentation the brand could not brief its retail partners with confidence.

The solution

We proposed a dedicated PBT/polyester blend programme built around mill-direct development with a single technical contact. Development started with A4 lab dips and a full construction sheet covering fibre content, GSM, width, stretch and recovery, and colour fastness. Only after the brand approved hand feel and performance targets did the project move to a pre-production lot for fit sampling.

Sample and fit approval for the PBT/polyester blend construction

Implementation

• Development: lab dips and physical samples in 5 working days.
• Approval: colour, hand feel and stretch signed off in two rounds.
• Bulk: consolidated dye lots to hold shade continuity.
• QC: inline inspection plus final random inspection before packing.
• Testing: ISO 11092 breathability on every bulk lot.

Specification delivered

Results

The new PBT/polyester blend programme helped Vertex Sport raised the opacity rating to fully squat-proof under test. The fitness unitards line launched on schedule, and wash durability, opacity and fit consistency all held up through the first retail season. The brand has since extended the programme into additional colours and styles.

“The development process was transparent from the first sample. We finally had the data we needed to brief our retail partners with confidence.” — Vertex Sport Product Team

Inline inspection and packing before the fitness unitards shipment

Key takeaway

Moving from a trading model to mill-direct development removed the hidden risks in the supply chain. With documented construction, controlled shade management and inline quality control, Vertex Sport could concentrate on design and marketing instead of firefighting production issues.