Soccer teams are very strictly color coordinated at the international level (and at most lower levels). The two teams must have matching uniforms distinct from each other, and additionally the two keepers must be in colors distinct both from each other and from the teams' kits.
But it seems like anything goes with the boots. Some players color coordinate with their kits while others just go for crazy neon. Is there any rhyme or reason to this? Are there any rules players must follow when selecting their boots?