Lumenfield Switzerland: Gym and Strength Training Line Climate and Heat Evaluation
Lumenfield is a Switzerland-based brand whose gym and strength training line is one of its most demanding programmes. Heat changes how a fabric behaves, so we evaluated the recycled nylon interlock in genuinely hot conditions for Lumenfield, based in Switzerland.
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 | 170 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
Test environment
Sessions ran at 30 to 34 degrees with high humidity, which is the condition where sweat cannot evaporate and complaints begin. Garments were weighed before and after each session to measure retained moisture.
Thermal behaviour
The fabric held opacity above 96% at 30% extension, and skin temperature stayed below the control fabric across the session. That difference is what a wearer describes simply as feeling cooler.
Evaluation session with the Lumenfield team
Drying after the session
Garments were re-weighed at 30 and 60 minutes. The fabric released most of its moisture within the first half hour, which matters when Lumenfield runs back-to-back sessions.
Comfort feedback
Wearers reported less cling and less chafe during resistance training and circuit work. Both improvements come from moving moisture rather than storing it, which is why construction mattered more than any finish in this test.
Test records and inspection notes for the Gym and Strength Training Line
Scorecard
| Criterion | Result |
|---|---|
| Heat comfort | 4.5 / 5 |
| Moisture transport | 4.7 / 5 |
| Drying speed | 4.4 / 5 |
| Cling and chafe | 4.6 / 5 |
| Odour control | 4.5 / 5 |
“Fifty washes later the fabric still performs. That is what convinced our buying team.” — Lumenfield Technical Team
Packed bulk rolls before shipment to Switzerland
Verdict and recommendation
For hot and humid markets the recycled nylon interlock is the right choice, provided the pattern keeps the ventilation zones exactly where we placed them. 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.
