Sports science has become a crucial aspect of football in recent years and players often wear a piece of technology under their jerseys
If you watch a lot of football and pay close attention to a team, you will have noticed that many footballers are now wearing under-shirt garments that, to some, resemble a sports bra.
It's not a bra they are wearing though - it's a highly sophisticated piece of technology that is designed to aid players and their clubs in their physical development, ensuring they perform at an optimum level.
So, in case you've been confused and were wondering what exactly players were wearing, Goal brings you everything you need to know.