Polyester Elastane Chitosan Finish UPF 50+ Sun Protection Interlock Knit is a double-bed interlock knit developed for Base Layers where next-to-skin comfort with continuous moisture movement decides whether a style succeeds. The base is polyester elastane with a bio-based chitosan finish, which gives a bio-derived antibacterial route for restricted substance sensitive programmes. The result is a fabric that delivers UPF 50+ Sun Protection in daily use rather than only in a laboratory.
Polyester Elastane Chitosan Finish 280 GSM Interlock Knit, face view
Key specifications
| Parameter | Value |
|---|---|
| Fabric name | Polyester Elastane Chitosan Finish UPF 50+ Sun Protection Interlock Knit |
| Composition | polyester elastane with a bio-based chitosan finish |
| Construction | Interlock Knit (a double-bed interlock knit) |
| Weight | 280 GSM |
| Width | 155 cm |
| Function | UPF 50+ Sun Protection — blocks ultraviolet radiation for outdoor training |
| Performance target | UPF rating above 50 with UVA below 5% |
| Test method | AATCC 183 ultraviolet transmittance |
| Additional value | protection held after 40 washes and in the wet state |
| Stretch | Four-way, recovery above 92% |
| Certification | OEKO-TEX Standard 100, REACH compliant inputs |
| MOQ | 300 m per colour |
| Lead time | 20–25 days after approval |
Why this construction works
Performance comes from three decisions: the yarn, the stitch and the finishing route. polyester elastane with a bio-based chitosan finish supplies the base behaviour, a double-bed interlock knit sets how air and moisture move, and finishing is kept deliberately light so the attributes survive washing.
Interlock Knit construction shown at close range
Performance features
- UPF 50+ Sun Protection: blocks ultraviolet radiation for outdoor training, measured by AATCC 183 ultraviolet transmittance.
- Hand and comfort: a bio-derived antibacterial route for restricted substance sensitive programmes.
- Construction benefit: identical faces on both sides, so the fabric stays opaque under tension.
- Consistency: GSM and width tolerance are locked per lot and recorded on the inspection sheet.
- Durability: performance is verified after repeated washing, not only as delivered.
Recommended applications
Specified mainly for Base Layers, and suited to any programme where next-to-skin comfort with continuous moisture movement is written into the brief. Designers use the same base for matching styles, which keeps colour continuity simple across a collection.
UPF 50+ Sun Protection fabric prepared for Base Layers production
Dyeing, finishing and customisation
Dyeing runs on a controlled recipe with consolidated dye lots to hold shade continuity. Finishing options include wicking, antibacterial, soft touch and anti-pilling, applied after lab trials so the hand approved in sampling is the hand delivered in bulk.
Care instructions
- Machine wash at 30 degrees with mild detergent, no fabric softener.
- Dry away from direct heat and do not tumble dry hot.
- Cool iron on the reverse if needed, and avoid bleach.
Ordering, sampling and quality control
Sampling is fast: A4 hand feel cards, laboratory dips and a 5 metre trial roll within a week. Bulk runs in 20-25 days, with inline inspection and a final random inspection before packing.
Roll inspection and packing before shipment
Frequently asked questions
Can the weight and width be changed? Yes. Most programmes run between 140 and 340 GSM, and width can be set between 150 and 180 cm to match your marker. Changing weight changes cover and stretch, so we re-test before confirming.
Is the performance tested on every lot? Yes. The named test method is repeated on bulk fabric, not only on the approval sample, and the report carries the lot number so results can be traced back.
