It appears to be from where the non-woven fabric was touching.
There are none inside, but there are some on the parts that were folded and touched the non-woven fabric.
The pink one had quite a few stains.
Daily Cleaning: Use a soft brush or damp cloth to gently wipe away dirt. Avoid harsh chemicals. For mesh areas, use diluted mild detergent and a soft brush.
Drying: Air dry in a cool, shaded place after cleaning. Avoid direct sunlight or high heat, which can cause fading and glue deterioration.
Storage: Stuff with paper to maintain shape when not in use. Store in a dry, ventilated area to prevent mold. Rotate between multiple pairs to extend lifespan.
Usage Notes: Designed for basketball. Not recommended for hiking, long-distance running, or other specialized sports where different performance features are required.
Het product werd op tijd geleverd en kwam in goede staat aan. De kwaliteit lijkt in orde en het komt overeen met de beschrijving. Tot nu toe ben ik tevreden met de aankoop.