Why T-Shirts Pill on the Shoulders (Backpack Friction, Not Just Washing)
Pilling — those small fabric balls that build up on a shirt’s surface — gets blamed on the washing machine almost by default, but shoulder-specific pilling has a second, very common cause: a backpack strap rubbing the exact same two spots on a shirt for hours a day, every school day. Updated September 4, 20262
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