Shrinkage and Fabric Growth Solutions for Running Shorts: Care and Service Life Advice
Care instructions decide whether shrinkage and fabric growth stays solved for the life of the running shorts, not just until delivery.
What shortens performance
dimensions change after washing or hanging becomes obvious earlier when the garment is dried hot or washed with softener, because both attack the finish and the elastic. Because high cadence movement plus perspiration at the waistband, target checks are made on a worn sample rather than flat fabric alone.
Washing guidance
Wash at 30 degrees inside out with similar colours. Mild detergent preserves the finish applied for shrinkage and fabric growth. Keep AATCC 135 dimensional change named in the tech pack so every lot is measured the same way.
Drying and storage
dry flat rather than tumble dry. Where running shorts is worn for road, trail and track training, set tolerances around that range of movement.
Expected service life
With correct care the target of under 3% in length and 4% in width after five washes remains approachable for 40-50 home washes, after which routine replacement is reasonable. Any change to lightweight woven or knit body with a knit liner requires re-testing against under 3% in length and 4% in width after five washes before bulk is released.
Supporting the customer
Print clear care wording and mention AATCC 135 dimensional change validation on the product page so claims can be supported if questioned. Past reports from AATCC 135 dimensional change help the mill reproduce the same recipe on the next order.
