What are footballer's vests for?

Surely you've often wondered what use the vest-bra's have that the players wear during matches. We will explain to you the usefulness of these to football players.

Footballer Mens Vest - Big Crocodile

With the variable SKLZ weight vest you can complete more intensive training as a footballer. The resistance of the vest can be changed by adding more

SKLZ weighted vest

Why are footballers wearing 'sports bras' at FIFA World Cup?

Footballers don't 'wear bras' - sporting reasons for under-shirt clothing explained

TV Times Footballer Kevin Keegan Men's Vest

Game, Set, and Match: Why Footballers Wear Bra-Like Vests - Sify

Ready] Men Sports Football Dumbbell Neoprene Training Chest Protector Sport Gym Vest

Jesus Loves You Footballer Christmas Tank Top – Spoofytees

The real difference in fitness, speed and endurance between average park footballer and Premier League star revealed - Mirror Online

Clinton Morrison In JD4 Blazer & Waistcoat – Marc Darcy

England Rugby's Jack Nowell in Max Black Suit – Marc Darcy

Why Soccer Players Wear Vests/Pinnies On The Sidelines - Get Hyped Sports

What is the purpose those small “vests” that footballers wear solely during training? : r/football

Footballers and their entourages: Money, status, family and friendship – what could go wrong? - The Athletic

Footballers don't 'wear bras' - sporting reasons for under-shirt clothing explained