Combing is fibre preparation
Raw cotton has fibres of different lengths. The short ones stick out of the finished yarn, which is what makes a cheap shirt feel rough and pill after a few washes.
Combing aligns the long fibres and removes the short ones before spinning. The result is a smoother, stronger yarn that pills less — at a cost premium of roughly 8–15%.
Spinning is yarn construction
Ring spinning draws and twists the fibre into a fine, smooth yarn. Open-end (rotor) spinning is faster and cheaper, producing a coarser yarn with more surface hair.
Neither is "better" in the abstract: open-end is perfectly good for a giveaway tee, and unnecessary for a premium retail shirt.
- Combed + ring-spun: smoothest, best for fine print detail.
- Carded + ring-spun: common mid-range.
- Combed + open-end: unusual, and the combing premium buys less than expected.
- Carded + open-end: cheapest, coarsest.
What you actually notice as a buyer
Smoothness on the first touch, pilling after ten washes, and print edge sharpness. Fine type holds better on a smoother yarn because there is less surface hair for the ink to sit on unevenly.
What you do not notice: the label. Most shirts do not state the spinning method at all, which is why asking the question directly is worth more than reading the tag.
When to pay for it
Pay for combed when the shirt is sold on feel — retail basics, premium blanks, anything the customer touches in a shop. Skip it on giveaways and heavy print coverage, where the surface is covered anyway.
The one case where it is nearly always worth it: dark colours. A coarse yarn shows surface fuzz on black more than on white.