Northlane Active Sweden: Odor-Free Yoga Shorts Built on Coffee Ground Polyester Yarn
Northlane Active is a Sweden-based activewear label whose yoga shorts programme sells directly to consumers and through selected retail partners. The team asked us to rebuild the fabric from scratch because the sustainability team rejected a biocidal finish that was on the first sample. The target was odour control that complied with the brand's restricted substance list.
Northlane Active: odour-control swatch set for the yoga shorts programme
The challenge
The smell built up at the inner thigh and the waistband, where sweat sits longest during a session. The previous fabric was a standard synthetic knit with no odour strategy, so bacteria broke the sweat down on the fabric and the smell became permanent after a few weeks. An internal compliance review before bulk booking made the problem urgent: the brand needed a fix before the next bulk booking, not a new supplier search.
The fabric solution
We built the programme around Coffee Ground Polyester Yarn on a polyester filament knit base. The mechanism matters: micronised spent coffee grounds trap odour molecules and add recycled content. Keeping the base at brushed jersey with 20% elastane and 225 GSM meant the hand, the stretch and the cover stayed exactly where the design team wanted them, because odour control changed the chemistry and the construction rather than the silhouette.
Wear trial and fit approval of the polyester filament knit fabric
Development and implementation
- Week 1: brief agreed, sweat zone mapped, target set as odour reduction above 75% with recycled content above 3% by ISO 17299-2.
- Week 2–3: laboratory knits produced and tested; add-on level adjusted until the target was met with margin.
- Week 4–5: wear trial on finished yoga shorts, assessed after eight hours of wear.
- Pre-production: wash durability confirmed at permanent inside the fibre, care wording written as standard laundering with mild detergent.
- Bulk: fixed recipe, consolidated dye lots, ISO 17299-2 repeated on every lot.
Specification delivered
| Parameter | Value |
|---|---|
| Product | Yoga Shorts |
| Base construction | brushed jersey with 20% elastane, 225 GSM |
| Odour-control system | Coffee Ground Polyester Yarn |
| Performance target | odour reduction above 75% with recycled content above 3% |
| Test method | ISO 17299-2 |
| Service life | permanent inside the fibre |
| Added cost | a 9% yarn premium |
| Certification | OEKO-TEX Standard 100, REACH compliant inputs |
Results
The premium tier sold through 22% faster than the previous season, and the same construction was extended into two further colourways. The odour value was re-measured on bulk fabric rather than on the approval sample, so the result reflects what customers actually received. The programme is now on its third repeat with the same recipe.
“Two seasons on, the odour value is still there. That is why the style stayed in the range.” — Northlane Active Product Team
Inline inspection and packing before the yoga shorts shipment
Key takeaway
The brand's real problem was a claim it could not support. Once testing was tied to a named standard and repeated per lot, the same fabric could be defended to retailers and to customers. For Northlane Active, that turned a recurring complaint into a feature the brand could sell.
