Pilling happens when short fibres work to the surface through friction and tangle into small balls. Causes are short fibres, loosely twisted yarns, an open knit and wear friction. Prevent it by choosing combed cotton or long-staple yarns, a denser knit and an anti-pilling finish. Blends with polyester can pill more persistently, because the balls do not break off. Wash inside out at a low temperature with a gentle cycle. Ask the supplier for a pilling test result.
What causes pilling and how do I prevent it?

pillingqualitycare
Printing & decorationWhat is the difference between cut-away and tear-away stabiliser?
Cut-away stays permanently behind the embroidery and is trimmed around it, while tear-away is torn off after stitching.
Printing & decorationWhat is HTV (heat transfer vinyl) and which knit is it applied to?
HTV is a vinyl film that is cut on a plotter and applied by heat pressing.
Printing & decorationWhat knit weight is best for screen printing?
For screen printing, single jersey of 160–220 gsm is a safe choice, and for heavyweight tees 220–280 gsm.