Why do so many footballers wear a long sleeved top under a short sleeved strip when kit suppliers offer long and short sleeved options for the official strip?
They have two versions - one to keep the body warm and one to help keep the body cool. They both wick sweat away from the body (Again, to help keep the body cool).
Long sleeved "body armour" worn under football tops is nothing like the same as wearing a long sleeved version of a football top and is worn for entirely different reasons.
It's a reasonable question as to why players who choose to wear such body armour though don't always wear a long sleeved top to cover it. They would have to do so if it was a different colour.
They have two versions - one to keep the body warm and one to help keep the body cool. They both wick sweat away from the body (Again, to help keep the body cool).
I shouldn't have clicked the submit button so quickly...
The players have to wear the same colour base layer top as the football shirt, because they're not allowed to wear a long-sleeved top the same colour as the Goalkeeper. They could claim (In their own penalyty box) that it was the arm of the Goalie who touches the ball, instead of the player, who would then be sent off for deliberate handball and a penalty also awarded against the team.
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