Summary: This color alters your perception of the world. Evidence that it does, how it does, why it does and some implications are presented below.

(Overcoming Bias: Seeing Red)

Across a range of sports, we find that wearing red is consistently associated with a higher probability of winning. These results indicate not only that sexual selection may have influenced the evolution of human response to colours, but also that the colour of sportswear needs to be taken into account to ensure a level playing field in sport.¹

In the study quoted above Hill and Barton examine the outcomes of the 2004 Olympic Games in boxing, tae kwon do, Greco–Roman wrestling and freestyle wrestling. In these events competitors were for each bout randomly assigned red or blue outfits. In the matches where one side dominated the other outfit color made little difference. In close matches, however, combatants in red won over 60% percent of the time. This makes sense since there are presumably other factors that effect the outcome.

In soccer (or football, as the case might be):

Since 1947, English football teams wearing red shirts have been champions more often than expected on the basis of the proportion of clubs playing in red. To investigate whether this indicates an enhancement of long-term performance in red-wearing teams, we analysed the relative league positions of teams wearing different hues. Across all league divisions, red teams had the best home record, with significant differences in both percentage of maximum points achieved and mean position in the home league table. The effects were not due simply to a difference between teams playing in a colour and those playing in a predominantly white uniform, as the latter performed better than teams in yellow hues. No significant differences were found for performance in matches away from home, when teams commonly do not wear their “home” colours. A matched-pairs analysis of red and non-red wearing teams in eight English cities shows significantly better performance of red teams over a 55-year period.²

Of course it still isn't clear how red soccer teams win. They might have the benefit of deferential refereeing or they might be intimidating opposing teams.

Same goes for the combat sports. Hill and Barton figured that the color red had some physiological effect, perhaps increasing the testosterone levels of the p...

JonathanLonsdale

JonathanLonsdale

JonathanLonsdale

JonathanLonsdale

JonathanLonsdale

JonathanLonsdale