EXPLAINED: Why Some Striped Backs Are Forbidden in Football Kits
- Kit Rule: A rule using "Delta L" measurements determines if kit stripes can continue behind player numbers.
- Delta L Value: A Delta L value of 25 or less allows stripes to continue, while exceeding it requires a solid patch.
- Purpose of Rule: The rule exists to ensure clear visibility of player numbers for all, while allowing for traditional designs when possible.
If you've been watching the UEFA Champions League this week, you might have spotted something curious about striped and half-and-half kits - while some teams can keep their design behind player numbers, others are forced to use solid-color spaces. Barcelona's Blaugrana half-and-half design continues behind their numbers, but Feyenoord must use a solid white patch on their green and white shirt. What's the story behind this seemingly inconsistent rule?
Big thanks to our follower Robin for asking us about this topic. Feel free to ask us any questions regarding kits via social media or our Contact Form.
"Kit Mystery": Why Some Striped Backs Are Forbidden in Football Kits
The answer lies in the official Equipment Regulations and a technical measurement called "Delta L" that determines whether stripes can remain visible behind player numbers.
The Delta L Kit Rule Explained:
• The contrast between colors in the Number Zone must have a Delta L value of 25 or less
• If the Delta L value exceeds 25, teams must use a solid-color patch behind the number
• Delta L is measured using a spectrophotometer to ensure objective assessment
What Does This Mean in Practice?
When two colors on a striped shirt are similar in tone (like Barcelona's blue and maroon), the Delta L value is low, and the pattern is allowed to continue behind the number. However, if the stripes contrast too much (like Feyenoord's green and white half-and-half design), teams must ensure a solid background patch to ensure number visibility.
The regulation aims to ensure player numbers are clearly visible for officials, players, media, and spectators, while still allowing teams to maintain their traditional striped designs when possible.
So next time you're watching a match and notice these differences in kit designs, you'll know it's not arbitrary - it's all down to the science of color contrast!
