Trailhead Union Portugal: Trail Running Programme Field Test Report
Trailhead Union is a Portugal-based brand whose trail running programme is one of its most demanding programmes. Trailhead Union runs its trail running programme across Portugal and asked us to prove the fabric in the field rather than in a brochure. This report covers a full season of real use with upf 50+ sun protection knit.
Trailhead Union: UPF 50+ Sun Protection Knit in use during long off-road efforts on mixed terrain
Evaluation background
The programme covers trail shorts, technical tees and light shells, used for long off-road efforts on mixed terrain. The environment is mud, grit, wind and rapid weather changes and the requirement written into the brief was abrasion resistance with fast drying after stream crossings. Fabric was selected on that basis rather than on price alone.
Fabric under evaluation
| Parameter | Value |
|---|---|
| Fabric | UPF 50+ Sun Protection Knit |
| Composition | polyester spandex with UV absorber |
| Weight | 170 GSM |
| Width | 170 cm |
| Primary function | blocks ultraviolet radiation during outdoor sessions |
| Target | UPF above 50 with UVA transmission below 5% |
| Test method | AATCC 183 |
| Additional note | protection retained when wet |
| Certification | OEKO-TEX Standard 100 |
UPF 50+ Sun Protection Knit close-up showing the fabric surface
Test scope
Twenty garments were issued to regular participants and tracked for eight weeks. Every item was used for long off-road efforts on mixed terrain and laundered under the same domestic conditions, so the only real variable was wear.
Conditions covered
The programme ran through mud, grit, wind and rapid weather changes. That is the environment the fabric has to survive, and it is harsher than any laboratory chamber we could have built.
Evaluation session with the Trailhead Union team
What we measured
Garments were inspected every two weeks for surface wear, seam condition, dimensional change and retained hand. Fabric was retested at the end of the period against AATCC 183.
What users reported
Participants logged comfort, drying behaviour and any irritation. The recurring comment was that the upf 50+ sun protection knit stayed comfortable at the point where abrasion resistance with fast drying after stream crossings would normally be lost.
Test records and inspection notes for the Trail Running Programme
Scorecard
| Criterion | Result |
|---|---|
| Comfort in use | 4.5 / 5 |
| Drying behaviour | 4.7 / 5 |
| Surface wear | 4.4 / 5 |
| Dimensional stability | 4.6 / 5 |
| Value | 4.5 / 5 |
“Development was transparent from the first sample and bulk matched the approval exactly.” — Trailhead Union Technical Team
Packed bulk rolls before shipment to Portugal
Verdict and recommendation
Field testing confirmed the laboratory picture. The upf 50+ sun protection knit held its UPF above 50 with UVA transmission below 5% across the whole season and we recommend it for the next programme without change. For Trailhead Union 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.
