Lumenfield Sweden: Gym and Strength Training Line Laboratory Test Report
Lumenfield is a Sweden-based brand whose gym and strength training line is one of its most demanding programmes. This report documents the laboratory qualification of the recycled nylon interlock supplied to Lumenfield for its gym and strength training line. Every figure below was produced on bulk fabric, not on an approval swatch.
Lumenfield: Recycled Nylon Interlock in use during resistance training and circuit work
Evaluation background
The programme covers leggings, training tops and shorts, used for resistance training and circuit work. The environment is short bursts of high load against equipment surfaces and the requirement written into the brief was squat-proof coverage with recovery after repeated stretch. Fabric was selected on that basis rather than on price alone.
Fabric under evaluation
| Parameter | Value |
|---|---|
| Fabric | Recycled Nylon Interlock |
| Composition | 78% GRS recycled nylon / 22% spandex |
| Weight | 280 GSM |
| Width | 175 cm |
| Primary function | stays fully opaque under tension while carrying a recycled claim |
| Target | opacity above 96% at 30% extension |
| Test method | AATCC 183 |
| Additional note | GRS chain of custody documents |
| Certification | OEKO-TEX Standard 100 |
Recycled Nylon Interlock close-up showing the fabric surface
Samples and conditioning
Three bulk lots were sampled at random and conditioned for 24 hours before testing. Results are reported as the worst of the three, which is the number a brand should plan around.
Test methods
The primary method was AATCC 183, supported by dimensional change to AATCC 135, pilling to ISO 12945-2 and colour fastness to ISO 105-C06.
Evaluation session with the Lumenfield team
Results
The fabric reached opacity above 96% at 30% extension, with GRS chain of custody documents. All supporting tests passed the agreed limits, and the report carries the lot numbers so the results can be reproduced.
Interpretation
Numbers only matter against the use case. For gym and strength training line the relevant result is that the fabric keeps stays fully opaque under tension while carrying a recycled claim after conditioning, which is what protects the wearer during resistance training and circuit work.
Test records and inspection notes for the Gym and Strength Training Line
Scorecard
| Criterion | Result |
|---|---|
| Primary function | 4.4 / 5 |
| Dimensional change | 4.9 / 5 |
| Pilling grade | 4.5 / 5 |
| Colour fastness | 4.7 / 5 |
| Consistency | 4.3 / 5 |
“Fifty washes later the fabric still performs. That is what convinced our buying team.” — Lumenfield Technical Team
Packed bulk rolls before shipment to Sweden
Verdict and recommendation
The bulk fabric met every agreed target. The lot is released and we recommend repeating the same test set on each future delivery of the recycled nylon interlock. For Lumenfield the practical next steps are to keep the current specification for the repeat, retain the shade standard, and issue AATCC 183 results with every lot so any claim can be supported with data.
